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Munich Quantum Valley (MQV)
Funded by Free State of Bavaria
The Munich Quantum Valley (MQV) has been founded in 2021 by the Bavarian State Government on the initiative of the Max-Planck Society, the Fraunhofer Society for the Advancement of Applied Research, the Bavarian Academy of Sciences and Humanities, together with Germany’s leading universities, the Technical University of Munich (TUM) and the Ludwig Maximilian University of Munich (LMU) to establish a unique European center for quantum science and technology. The key objective is to place Bavaria at the very forefront of a research field with high scientific and future economic relevance. On the basis of the Munich Quantum Valley, other Bavarian sites will be integrated into an efficient network, making MQV an important nucleus and pillar of a national and European quantum strategy.

In August 2020, the spokespersons of the Excellence Cluster MCQST – Immanuel Bloch, Ignacio Cirac and Rudolf Gross – started an initiative to establish the Munich Quantum Valley. In a strategy paper, written with support of Max-Planck Vice President Klaus Blaum and FhG Research Director Raoul Klingner, they pointed out that the larger Munich area with its excellent research institutions as well as its active industrial, high-tech and venture capital environment is ideally suited to establish a unique European center for quantum science and technology (QST).

Financial support of MQV was immediately included into the Bavarian «Hightech Agenda Plus». Meanwhile, a Memorandum of Understanding has been signed by Prime Minister Söder and the presidents of the five founding research organizations (see MQV Kick-off event). For 2022/23, a budget of 120 Mio. €  is already allocated and a total budget of 300 Mio. € is planned. By MQV, Bavaria as a whole will be developed into a leading international center with the potential to attract the best researchers and open up new opportunities for Bavaria as a business location in this innovative field. To implement MQV, the following three-point plan was proposed in the strategy paper will be implemented:

  1. Foundation of a Center for Quantum Computing and Quantum Technology to foster networking with industry, to develop priorities in QST R&D, and to coordinate the allocation of funding with the following priorities:
    • Development, realization and operation of quantum computers based on a longterm institutional funding to guarantee international competitiveness.
    • Support of basic science and development of basic quantum technologies within so-called lighthouse projects.
    • Technology transfer to industry and start-ups.
  2. Establishment of a Quantum Technology Park to provide the technological infrastructure for the development and fabrication of quantum devices.
  3. Qualification and Education of the next generation of quantum experts in natural and computer sciences as well as engineering, including training and re-education of skilled employees in industry.
Publications
Manuel Müller, Johannes Weber, Fabian Engelhardt, Victor A. S. V. Bittencourt, Thomas Luschmann, Mikhail Cherkasskii, Sebastian T.B. Goennenwein, Silvia Viola Kusminskiy, Stephan Geprägs, Rudolf Gross, Matthias Althammer, Hans Huebl
Research Article | arXiv:2303.08429
M. Renger, S. Gandorfer, W. Yam, F. Fesquet, M. Handschuh, K. E. Honasoge, F. Kronowetter, Y. Nojiri, M. Partanen, M. Pfeiffer, H. van der Vliet, A. J. Matthews, J. Govenius, R. N. Jabdaraghi, M. Prunnila, A. Marx, F. Deppe, R. Gross, K. G. Fedorov
Research Article | arXiv:2308.12398
F. Kronowetter, M. Würth, W. Utschick, R. Gross, K. G. Fedorov
Research Article | arXiv:2308.02343
S. Gandorfer, M. Renger, W. K. Yam, F. Fesquet, A. Marx, R. Gross, K. G. Fedorov
Research Article | arXiv:2308.02389
Kurt Uhlig
Research Article | Cryogenics 130, 103649  (2023)
Monika Scheufele, Janine Gückelhorn, Matthias Opel, Akashdeep Kamra, Hans Huebl, Rudolf Gross, Stephan Geprägs, Matthias Althammer
Research Article | APL Materials 11, 091115  (2023)
Preprint: arXiv:2306.00375
Rasmus Flaschmann, Christian Schmid, Lucio Zugliani, Stefan Strohauer, Fabian Wietschorke, Stefanie Grotowski, Björn Jonas, Manuel Müller, Matthias Althammer, Rudolf Gross, Jonathan J. Finley, Kai Müller
Research Article | Materials for Quantum Technology 3, 035002  (2023)
Florian Fesquet, Fabian Kronowetter, Michael Renger, Qiming Chen, Kedar Honasoge, Oscar Gargiulo, Yuki Nojiri, Achim Marx, Frank Deppe, Rudolf Gross, Kirill G. Fedorov
Research Article | Physical Review A 108, 032607  (2023)
Preprint: arXiv:2203.05530
Stefan Filipp (Eds. Alissa Wilm, Florian Neukart)
Book | Springer-Verlag GmbH  (2023)
Fabian Kronowetter
Research Article | Neues 226, 24-29  (2023)
Rudolf Gross
Research Article | Neues 226, 20-23  (2023)
Qi-Ming Chen, Michael Fischer, Yuki Nojiri, Michael Renger, Edwar Xie, Matti Partanen, Stefan Pogorzalek, Kirill G. Fedorov, Achim Marx, Frank Deppe, Rudolf Gross
Research Article | Nature Communications 14, 2896  (2023)
Preprint: arXiv:2206.06338
F. Kronowetter, F. Fesquet, M. Renger, K. Honasoge, Y. Nojiri, K. Inomata, Y. Nakamura, A. Marx, R. Gross, K. G. Fedorov
Research Article | Physical Review Applied 20, 024049  (2023)
Preprint: arXiv:2303.01026
Thomas Luschmann, Alexander Jung, Stephan Geprägs, Franz X. Haslbeck, Achim Marx, Stefan Filipp, Simon Gröblacher, Rudolf Gross, Hans Huebl
Research Article | Materials for Quantum Technology 3, 021001  (2023)
Preprint: arXiv:2301.11213
Giulio Terrasanta, Timo Sommer, Manuel Müller, Matthias Althammer, Rudolf Gross, Menno Poot
Research Article | Optics Express 30, 8537-8549  (2022)
Preprint: arXiv:2110.01993
M. Renger, S. Pogorzalek, F. Fesquet, K. Honasoge, F. Kronowetter, Q. Chen, Y. Nojiri, K. Inomata, Y. Nakamura, A. Marx, F. Deppe, R. Gross, K. G. Fedorov
Research Article | Physical Review A 106, 052415  (2022)
Preprint: arXiv:2207.06090
Michael Fischer
PHD Thesis | Technical University of Munich  (2022)
Manuel Müller, Thomas Luschmann, Andreas Faltermeier, Stefan Weichselbaumer, Leon Koch, Gerhard B. P. Huber, Hans Werner Schumacher, Niels Ubbelohde, David Reifert, Thomas Scheller, Frank Deppe, Achim Marx, Stefan Filipp, Matthias Althammer, Rudolf Gross, Hans Huebl
Research Article | Materials for Quantum Technology 2, 015002  (2022)
Preprint: arXiv:2112.08296
Qi-Ming Chen
PHD Thesis | Technical University of Munich  (2022)
Qi-Ming Chen, Meike Pfeiffer, Matti Partanen, Florian Fesquet, Kedar E. Honasoge, Fabian Kronowetter, Yuki Nojiri, Michael Renger, Kirill G. Fedorov, Achim Marx, Frank Deppe, Rudolf Gross
Research Article | Physical Review B 106, 214505  (2022)
Preprint: arXiv:2109.07762
Qi-Ming Chen, Matti Partanen, Florian Fesquet, Kedar E. Honasoge, Fabian Kronowetter, Yuki Nojiri, Michael Renger, Kirill G. Fedorov, Achim Marx, Frank Deppe, Rudolf Gross
Research Article | Physical Review B 106, 214506  (2022)
Preprint: arXiv:2109.07766
M. Renger, S. Pogorzalek, Q. Chen, Y. Nojiri, K. Inomata, Y. Nakamura, M. Partanen, A. Marx, R. Gross, F. Deppe, K. G. Fedorov
Research Article | npj Quantum Information 7, 160  (2021)
Preprint: arXiv:2011.00914
Designing superconducting qubit chips and multi-qubit couplers
Gerhard Huber
Master Thesis | Technische Universität München  (2021)
Development of a Fabrication Process for High-Coherence Niobium Qubits
Niklas Bruckmoser
Master Thesis | Technische Universität München  (2021)
Optimal Control of Entangling Gates in Superconducting Tunable-Coupler Architectures
Niklas Glaser
Master Thesis | Technische Universität München  (2021)
F. Deppe, Edwar Xie, K.G. Fedorov, G. Andersson, J. Müller, A. Marx, R. Gross
Research Article | 2021 International Applied Computational Electromagnetics Society Symposium (ACES), IEEE Xplore , pp. 1-4  (2021)
Coordinator

Initiated by:
Klaus Blaum, Immanuel Bloch, Ignacio Cirac, Rudolf Gross, Raoul Klingner

Funded by
Free State of Bavaria
Funding program
Bavarian State Ministry for Science and Art (StMWK)
Munich Center for Quantum Science and Technology (MCQST)
Funded by German Research Foundation (DFG)
The cluster of excellence Munich Center for Quantum Science and Technology (MCQST) comprises seven research units within disciplines such as physics, mathematics, computer science, electrical engineering, material science, and chemistry, covering all areas of Quantum Science and Technology (QST) from basic research to applications. Its main goal is to build a world-leading center in QST, with a multidisciplinary profile, addressing important scientific and technological questions. It links groundbreaking research with industrial partners, creating a unique environment for Quantum Science and Technology via carefully designed structural measures that will transform the existing scientific and technological environment.

Quantum Mechanics and Information Science have revolutionized our modern world beyond imagination. Whilst quantum mechanics forms the basis for our understanding of the microscopic world, information science is the basic building block for information processing and communication in our digital age. Today we are witnessing a scientific and technological revolution in which Information Science and Quantum Mechanics no longer stand as separate entities, but have rather been united in the common language of Quantum Information Science. First developed to describe the working principles of future Quantum Computers, Quantum Information Science has emerged as an even more powerful description of our physical world, with wide ranging relevance, directly linking fields such as quantum materials and quantum chemistry to seemingly disparate fields such as the cosmology of black holes. At the core of this description is the notion of entanglement, an essential feature without any classical analogue that is responsible for a plethora of astonishing phenomena and applications of Quantum Physics.

These dramatic developments have led to the new combined research field of Quantum Science and Technology (QST), in which these diverse topics, their interconnection as well as their consequences for practical applications are being explored. QST unites multidisciplinary research across physics, mathematics, computer science, electrical engineering, materials science, chemistry, and recently, even cosmology and high energy physics.The core goal of the Munich Center for Quantum Science and Technology (MCQST) is to discover and understand the novel and unifying concepts in the interdisciplinary research fields of QST and to make them tangible and practical, to develop the extraordinary applications within reach by building next-generation quantum devices.

At a fundamental science level, this includes the comprehensive understanding and control of entanglement in quantum many-body systems spanning different time, length and energy scales, through novel theoretical and experimental approaches in quantum information science. Applications for Quantum Devices and Materials to be developed at MCQST range from inherently secure communication and processing of information to ultrasensitive sensors and transducers for precision metrology.Munich is in a unique position to form such a world-leading research center in QST due to its longstanding experience, broad and proven interdisciplinary expertise, and outstanding excellence of the participating senior and junior researchers in all core fields of QST. Developing education and support for junior researchers in QST as well as advancing the strengths of Munich research structures within MCQST will ensure long-term and high-impact research as well as an ideal entry point for industry in this increasingly important field. It will allow Munich to achieve an outstanding visibility and assume a leading position in QST research.

Publications
Manuel Müller, Johannes Weber, Fabian Engelhardt, Victor A. S. V. Bittencourt, Thomas Luschmann, Mikhail Cherkasskii, Sebastian T.B. Goennenwein, Silvia Viola Kusminskiy, Stephan Geprägs, Rudolf Gross, Matthias Althammer, Hans Huebl
Research Article | arXiv:2303.08429
M. Renger, S. Gandorfer, W. Yam, F. Fesquet, M. Handschuh, K. E. Honasoge, F. Kronowetter, Y. Nojiri, M. Partanen, M. Pfeiffer, H. van der Vliet, A. J. Matthews, J. Govenius, R. N. Jabdaraghi, M. Prunnila, A. Marx, F. Deppe, R. Gross, K. G. Fedorov
Research Article | arXiv:2308.12398
F. Kronowetter, M. Würth, W. Utschick, R. Gross, K. G. Fedorov
Research Article | arXiv:2308.02343
S. Gandorfer, M. Renger, W. K. Yam, F. Fesquet, A. Marx, R. Gross, K. G. Fedorov
Research Article | arXiv:2308.02389
Sebastian Oberbauer, Shamil Erkenov, Werner Biberacher, Natalia D. Kushch, Rudolf Gross, Mark V. Kartsovnik
Research Article | Physical Review B 107, 075139  (2023)
Preprint: arXiv:2208.03230
Kurt Uhlig
Research Article | Cryogenics 130, 103649  (2023)
Jiang Zhang, Thi Ha Kyaw, Stefan Filipp, Leong-Chuan Kwek, Erik Sjöqvist, Dianmin Tong
Research Article | Physics Reports 1027, 1-53  (2023)
Preprint: arXiv:2110.03602
Joachim Hofer, Rudolf Gross, Gerard Higgins, Hans Huebl, Oliver F. Kieler, Reinhold Kleiner, Dieter Koelle, Philip Schmidt, Joshua A. Slater, Michael Trupke, Kevin Uhl, Thomas Weimann, Witlef Wieczorek, Markus Aspelmeyer
Research Article | Physical Review Letters 131, 043603  (2023)
Preprint: arXiv:2211.06289
Carolina Lüthi, Luis Flacke, Aisha Aqeel, Akashdeep Kamra, Rudolf Gross, Christian Back, Mathias Weiler
Research Article | Applied Physics Letters 122, 012401  (2023)
Preprint: arXiv:2210.00897
Monika Scheufele, Janine Gückelhorn, Matthias Opel, Akashdeep Kamra, Hans Huebl, Rudolf Gross, Stephan Geprägs, Matthias Althammer
Research Article | APL Materials 11, 091115  (2023)
Preprint: arXiv:2306.00375
Janine Gückelhorn, Sebastián de-la-Peña, Matthias Grammer, Monika Scheufele, Matthias Opel, Stephan Geprägs, Juan Carlos Cuevas, Rudolf Gross, Hans Huebl, Akashdeep Kamra, Matthias Althammer
Research Article | Physical Review Letters 130, 216703  (2023)
Preprint: arXiv:2209.09040
Rasmus Flaschmann, Christian Schmid, Lucio Zugliani, Stefan Strohauer, Fabian Wietschorke, Stefanie Grotowski, Björn Jonas, Manuel Müller, Matthias Althammer, Rudolf Gross, Jonathan J. Finley, Kai Müller
Research Article | Materials for Quantum Technology 3, 035002  (2023)
Florian Fesquet, Fabian Kronowetter, Michael Renger, Qiming Chen, Kedar Honasoge, Oscar Gargiulo, Yuki Nojiri, Achim Marx, Frank Deppe, Rudolf Gross, Kirill G. Fedorov
Research Article | Physical Review A 108, 032607  (2023)
Preprint: arXiv:2203.05530
Fabian Kronowetter
Research Article | Neues 226, 24-29  (2023)
Rudolf Gross
Research Article | Neues 226, 20-23  (2023)
Qi-Ming Chen, Michael Fischer, Yuki Nojiri, Michael Renger, Edwar Xie, Matti Partanen, Stefan Pogorzalek, Kirill G. Fedorov, Achim Marx, Frank Deppe, Rudolf Gross
Research Article | Nature Communications 14, 2896  (2023)
Preprint: arXiv:2206.06338
F. Kronowetter, F. Fesquet, M. Renger, K. Honasoge, Y. Nojiri, K. Inomata, Y. Nakamura, A. Marx, R. Gross, K. G. Fedorov
Research Article | Physical Review Applied 20, 024049  (2023)
Preprint: arXiv:2303.01026
Thomas Luschmann, Alexander Jung, Stephan Geprägs, Franz X. Haslbeck, Achim Marx, Stefan Filipp, Simon Gröblacher, Rudolf Gross, Hans Huebl
Research Article | Materials for Quantum Technology 3, 021001  (2023)
Preprint: arXiv:2301.11213
Giulio Terrasanta, Timo Sommer, Manuel Müller, Matthias Althammer, Rudolf Gross, Menno Poot
Research Article | Optics Express 30, 8537-8549  (2022)
Preprint: arXiv:2110.01993
Matthias Grammer
Master Thesis | Technische Universität München  (2022)
Marek Pechal, Federico Roy, Samuel A. Wilkinson, Gian Salis, Max Werninghaus, Michael J. Hartmann, Stefan Filipp
Research Article | Physical Review Research 4, 033190  (2022)
Preprint: arXiv:2111.12669
M. Renger, S. Pogorzalek, F. Fesquet, K. Honasoge, F. Kronowetter, Q. Chen, Y. Nojiri, K. Inomata, Y. Nakamura, A. Marx, F. Deppe, R. Gross, K. G. Fedorov
Research Article | Physical Review A 106, 052415  (2022)
Preprint: arXiv:2207.06090
Michael Fischer
PHD Thesis | Technical University of Munich  (2022)
Janine Gückelhorn, Akashdeep Kamra, Tobias Wimmer, Matthias Opel, Stephan Geprägs, Rudolf Gross, Hans Huebl, Matthias Althammer
Research Article | Physical Review B 105, 094440  (2022)
Preprint: arXiv:2112.03820
Deepankar Sri Gyan, Danny Mannix, Dina Carbone, James L. Sumpter, Stephan Geprägs, Maxim Dietlein, Rudolf Gross, Andrius Jurgilaitis, Van-Thai Pham, Helene Coudert-Alteirac, Jörgen Larsson, Daniel Haskel, Jörg Strempfer, Paul G. Evans
Research Article | Structural Dynamics 9, 045101  (2022)
Preprint: arXiv:2207.14409
Manuel Müller, Thomas Luschmann, Andreas Faltermeier, Stefan Weichselbaumer, Leon Koch, Gerhard B. P. Huber, Hans Werner Schumacher, Niels Ubbelohde, David Reifert, Thomas Scheller, Frank Deppe, Achim Marx, Stefan Filipp, Matthias Althammer, Rudolf Gross, Hans Huebl
Research Article | Materials for Quantum Technology 2, 015002  (2022)
Preprint: arXiv:2112.08296
Thomas Luschmann, Philip Schmidt, Frank Deppe, Achim Marx, Alvaro Sanchez, Rudolf Gross, Hans Huebl
Research Article | Scientific Reports 12, 1608  (2022)
Preprint: arXiv:2104.10577
Fabian Engelhardt, Victor A.S.V. Bittencourt, Hans Huebl, Oliver Klein, and Silvia Viola Kusminskiy
Research Article | Physical Review Applied 18, 044059  (2022)
Preprint: arXiv:2205.05088
Peter Eder
PHD Thesis | Technical University of Munich  (2022)
Christiane P. Koch, Ugo Boscain, Tommaso Calarco, Gunther Dirr, Stefan Filipp, Steffen J. Glaser, Ronnie Kosloff, Simone Montangero, Thomas Schulte-Herbrüggen, Dominique Sugny, Frank K. Wilhelm
Research Article | EPJ Quantum Technology 9, 19  (2022)
Qi-Ming Chen
PHD Thesis | Technical University of Munich  (2022)
Manuel Müller, Monika Scheufele, Janine Gückelhorn, Luis Flacke, Mathias Weiler, Hans Huebl, Stephan Geprägs, Rudolf Gross, Matthias Althammer
Research Article | Journal of Applied Physics 132, 233905  (2022)
Preprint: arXiv:2204.11498
Aneirin J. Baker, Gerhard B. P. Huber, Niklas J. Glaser, Federico Roy, Ivan Tsitsilin, Stefan Filipp and Michael J. Hartmann
Research Article | Applied Physics Letters 120  (2022)
Preprint: arXiv:2111.05938
Philipp Krüger
Master Thesis | Technische Universität München  (2022)
Qi-Ming Chen, Meike Pfeiffer, Matti Partanen, Florian Fesquet, Kedar E. Honasoge, Fabian Kronowetter, Yuki Nojiri, Michael Renger, Kirill G. Fedorov, Achim Marx, Frank Deppe, Rudolf Gross
Research Article | Physical Review B 106, 214505  (2022)
Preprint: arXiv:2109.07762
Qi-Ming Chen, Matti Partanen, Florian Fesquet, Kedar E. Honasoge, Fabian Kronowetter, Yuki Nojiri, Michael Renger, Kirill G. Fedorov, Achim Marx, Frank Deppe, Rudolf Gross
Research Article | Physical Review B 106, 214506  (2022)
Preprint: arXiv:2109.07766
Qi-Ming Chen, Florian Fesquet, Kedar E. Honasoge, Fabian Kronowetter, Yuki Nojiri, Michael Renger, Kirill G. Fedorov, Achim Marx, Frank Deppe, Rudolf Gross
Research Article | Physical Review A 105, 012405  (2022)
Preprint: arXiv:2107.01842
A. Aqeel, M. Azhar, N. Vlietstra, A. Pozzi, J. Sahliger, H. Huebl, T. T. Palstra, C. H. Back, and M. Mostovoy
Research Article | Physical Review B 103, L100410  (2021)
Preprint: arXiv:2005.00427
Matthias Althammer
Review | Physica Status Solidi (RRL) 15, 2100130  (2021)
Preprint: arXiv:2103.08996
M. Renger, S. Pogorzalek, Q. Chen, Y. Nojiri, K. Inomata, Y. Nakamura, M. Partanen, A. Marx, R. Gross, F. Deppe, K. G. Fedorov
Research Article | npj Quantum Information 7, 160  (2021)
Preprint: arXiv:2011.00914
Elisabeth Meidinger
Master Thesis | Technische Universität München  (2021)
Tobias Wimmer
PHD Thesis | Technical University of Munich  (2021)
Schwienbacher, Daniel
PHD Thesis | Technische Universität München  (2021)
Jasmin Graf, Sanchar Sharma, Hans Huebl, and Silvia Viola Kusminskiy
Research Article | Physical Review Research 3, 013277  (2021)
Preprint: arXiv:2012.00760
Designing superconducting qubit chips and multi-qubit couplers
Gerhard Huber
Master Thesis | Technische Universität München  (2021)
Development of a Fabrication Process for High-Coherence Niobium Qubits
Niklas Bruckmoser
Master Thesis | Technische Universität München  (2021)
Christopher Waas
Master Thesis | Technische Universität München  (2021)
Emir Karadza
Master Thesis | Technische Universität München  (2021)
R. Ramazashvili, P. D. Grigoriev, T. Helm, F. Kollmannsberger, M. Kunz, W. Biberacher, E. Kampert, H. Fujiwara, A. Erb, J. Wosnitza, R. Gross & M. V. Kartsovnik
Research Article | npj Quantum Materials 6, 11  (2021)
K. G. Fedorov, M. Renger, S. Pogorzalek, R. Di Candia, Q. Chen, Y. Nojiri, K. Inomata, Y. Nakamura, M. Partanen, A. Marx, R. Gross, F. Deppe
Research Article | Science Advances 7, eabk0891  (2021)
Preprint: arXiv:2103.04155
Patrick Missale
Bachelor Thesis | Technische Universität München  (2021)
Christoph Scheuer
Master Thesis | Technische Universität München  (2021)
Rudolf Gross
Other | Akadmie Aktuell (ISSN 1436 -753X), Heft 2 (74), 14-19  (2021)
G. Terrasanta, M. Müller, T. Sommer, S. Geprägs, R. Gross, M. Althammer, M. Poot
Research Article | Materials for Quantum Technology 1, 021002  (2021)
Preprint: arXiv:2103.08318
Manuel Müller, Raphael Hoepfl, Lukas Liensberger, Stephan Geprägs, Hans Huebl, Mathias Weiler, Rudolf Gross, Matthias Althammer
Research Article | Materials for Quantum Technology 1, 045001  (2021)
Preprint: arXiv:2102.09018
Frank Deppe, Kirill G. Fedorov, Achim Marx
Other | Akadmie Aktuell (ISSN 1436 -753X), Heft 2 (74), 36-38  (2021)
Tobias Wimmer, Janine Gückelhorn, Sebastian Wimmer, Sergiy Mankovsky, Hubert Ebert, Matthias Opel, Stephan Geprägs, Rudolf Gross, Hans Huebl, Matthias Althammer
Research Article | Physical Review B 104, L140404  (2021)
Preprint: arXiv:2103.12697
Misbah Yaqoob
Master Thesis | Technische Universität München  (2021)
Liensberger, Lukas
PHD Thesis | Technische Universität München  (2021)
Janine Gückelhorn, Tobias Wimmer, Manuel Müller, Stephan Geprägs, Hans Huebl, Rudolf Gross, Matthias Althammer
Research Article | Physical Review B 104, L180410  (2021)
Preprint: arXiv:2108.03263
Optimal Control of Entangling Gates in Superconducting Tunable-Coupler Architectures
Niklas Glaser
Master Thesis | Technische Universität München  (2021)
Hans Huebl
Other | Akadmie Aktuell (ISSN 1436 -753X), Heft 2 (74), 32-35  (2021)
Stefan Filipp
Other | Akadmie Aktuell (ISSN 1436 -753X), Heft 2 (74), 20-23  (2021)
Paul Rosenberger, Matthias Opel, Stephan Geprägs, Hans Huebl, Rudolf Gross, Martina Müller, Matthias Althammer
Research Article | Applied Physics Letters 118, 192401  (2021)
Preprint: arXiv:2103.02706
F. Deppe, Edwar Xie, K.G. Fedorov, G. Andersson, J. Müller, A. Marx, R. Gross
Research Article | 2021 International Applied Computational Electromagnetics Society Symposium (ACES), IEEE Xplore , pp. 1-4  (2021)
Luis Flacke, Valentin Ahrens, Simon Mendisch, Lukas Körber, Tobias Böttcher, Elisabeth Meidinger, Misbah Yaqoob, Manuel Müller, Lukas Liensberger, Attila Kákay, Markus Becherer, Philipp Pirro, Matthias Althammer, Stephan Geprägs, Hans Huebl, Rudolf Gross, Mathias Weiler
Research Article | Physical Review B 104, L100417  (2021)
Preprint: arXiv:2102.11117
Aristo Kevin Ardyaneira P
Bachelor Thesis | Technische Universität München  (2021)
Korbinian Rubenbauer
Master Thesis | Technische Universität München  (2021)
Ei Shigematsu, Lukas Liensberger, Mathias Weiler, Ryo Ohshima, Yuichiro Ando, Teruya Shinjo, Hans Huebl, and Masashi Shiraishi
Research Article | Physical Review B 103, 094430  (2021)
Manuel Müller, Lukas Liensberger, Luis Flacke, Hans Huebl, Akashdeep Kamra, Wolfgang Belzig, Rudolf Gross, Mathias Weiler, Matthias Althammer
Research Article | Physical Review Letters 126, 087201  (2021)
Preprint: arXiv:2007.15569
Lukas Liensberger, Franz X. Haslbeck, Andreas Bauer, Helmuth Berger, Rudolf Gross, Hans Huebl, Christian Pfleiderer, Mathias Weiler
Research Article | Physical Review B 104, L100415  (2021)
Preprint: arXiv:2102.11713
Monika Scheufele
Master Thesis | Technische Universität München  (2021)
Philipp Schwenke
Master Thesis | Technische Universität München  (2021)
Daniel Schwienbacher, Thomas Luschmann, Rudolf Gross, Hans Huebl
Research Article | arXiv:2011.08080
Akashdeep Kamra, Tobias Wimmer, Hans Huebl, and Matthias Althammer
Research Article | Physical Review B 102, 174445  (2020)
Stefan Weichselbaumer, Christoph W. Zollitsch, Martin S. Brandt, Rudolf Gross, Hans Huebl
Research Article | Physical Review Letters 125, 137701  (2020)
Florian Fesquet
Master Thesis | Technische Universität München  (2020)
Johanna Fischer, Matthias Althammer, Nynke Vlietstra, Hans Huebl, Sebastian T.B. Goennenwein, Rudolf Gross, Stephan Geprägs, Matthias Opel
Research Article | Physical Review Applied 13, 014019  (2020)
Preprint: arXiv:1907.13393
Tobias Hula, Katrin Schultheiss, Aleksandr Buzdakov, Lukas Körber, Mauricio Bejarano, Luis Flacke, Lukas Liensberger, Mathias Weiler, Justin M. Shaw, Hans T. Nembach, Jürgen Fassbender, and Helmut Schultheiss
Research Article | Applied Physics Letters 117, 042404  (2020)
Tobias Wimmer, Akashdeep Kamra, Janine Gückelhorn, Matthias Opel, Stephan Geprägs, Rudolf Gross, Hans Huebl, Matthias Althammer
Research Article | Physical Review Letters 125, 247204  (2020)
Preprint: arXiv:2008.00440
Julia Lamprich
Master Thesis | Technische Universität München  (2020)
Stephan Geprägs, Björn Erik Skovdal, Monika Scheufele, Matthias Opel, Didier Wermeille, Paul Thompson, Alessandro Bombardi, Virginie Simonet, Stéphane Grenier, Pascal Lejay, Gilbert Andre Chahine, Diana Quintero Castro, Rudolf Gross, Dan Mannix
Research Article | Physical Review B 102, 214402  (2020)
Preprint: arXiv:2009.13185
J. Gückelhorn, T. Wimmer, S. Geprägs, H. Huebl, R. Gross, and M. Althammer
Research Article | Applied Physics Letters 117, 182401  (2020)
Stephan Trattnig
Master Thesis | Technische Universität München  (2020)
Pogorzalek, Stefan
PHD Thesis | Technische Universität München  (2020)
Paul G. Evans, Samuel D. Marks, Stephan Geprägs, Maxim Dietlein, Yves Joly, Minyi Dai, Jiamian Hu, Laurence Bouchenoire, Paul B. J. Thompson, Tobias U. Schülli, Marie-Ingrid Richard, Rudolf Gross, Dina Carbone, Danny Mannix
Research Article | Science Advances 6, eaba9351  (2020)
Philip Schmidt, Mohammad T. Amawi, Stefan Pogorzalek, Frank Deppe, Achim Marx, Rudolf Gross, Hans Huebl
Research Article | Communications Physics 3, 233  (2020)
Preprint: arXiv:1912.08731
Weichselbaumer, Stefan
PHD Thesis | Technische Universität München  (2020)
Stephan Geprägs, Matthias Opel, Johanna Fischer, Olena Gomonay, Philipp Schwenke, Matthias Althammer, Hans Huebl, Rudolf Gross
Review | Journal of Applied Physics 127, 243902  (2020)
Preprint: arXiv:2004.02639
Maxim Dietlein
Master Thesis | Technische Universität München  (2020)
Stephan Geprägs, Christoph Klewe, Sibylle Meyer, Dominik Graulich, Felix Schade, Marc Schneider, Sonia Francoual, Stephen P. Collins, Katharina Ollefs, Fabrice Wilhelm, Andrei Rogalev, Yves Joly, Sebastian T.B. Goennenwein, Matthias Opel, Timo Kuschel, Rudolf Gross
Research Article | Physical Review B 102, 214438  (2020)
Preprint: arXiv:2010.03979
Qi-Ming Chen, Frank Deppe, Re-Bing Wu, Luyan Sun, Yu-xi Liu, Yuki Nojiri, Stefan Pogorzalek, Michael Renger, Matti Partanen, Kirill G. Fedorov, Achim Marx, Rudolf Gross
Research Article | arXiv:1912.09861
Adrían Gómez Pardo
Master Thesis | Technische Universität München  (2019)
Tobias Wimmer, Birte Coester, Stephan Geprägs, Rudolf Gross, Sebastian T. B. Goennenwein, Hans Huebl, Matthias Althammer
Research Article | Applied Physics Letters 115, 092404  (2019)
Lukas Liensberger, Akashdeep Kamra, Hannes Maier-Flaig, Stephan Geprägs, Andreas Erb, Sebastian T. B. Goennenwein, Rudolf Gross, Wolfgang Belzig, Hans Huebl, Mathias Weiler
Research Article | Physical Review Letters 123, 117204  (2019)
Luis Flacke, Lukas Liensberger, Matthias Althammer, Hans Huebl, Stephan Geprägs, Katrin Schultheiss, Aleksandr Buzdakov, Tobias Hula, Helmut Schultheiss, Eric R. J. Edwards, Hans T. Nembach, Justin M. Shaw, Rudolf Gross, Mathias Weiler
Research Article | Applied Physics Letters 115, 122402  (2019)
Daniel Schwienbacher, Matthias Pernpeintner, Lukas Liensberger, Eric R. J. Edwards, Hans T. Nembach, Justin M. Shaw, Mathias Weiler, Rudolf Gross, Hans Huebl
Research Article | Journal of Applied Physics 126, 103902  (2019)
S. Pogorzalek, K. G. Fedorov, M. Xu, A. Parra-Rodriguez, M. Sanz, M. Fischer, E. Xie, K. Inomata, Y. Nakamura, E. Solano, A. Marx, F. Deppe, R. Gross
Research Article | Nature Communications 10, 2604  (2019)
Tobias Wimmer, Matthias Althammer, Lukas Liensberger, Nynke Vlietstra, Stephan Geprägs, Mathias Weiler, Rudolf Gross, Hans Huebl
Research Article | Physical Review Letters 123, 257201  (2019)
Lukas Liensberger, Luis Flacke, David Rogerson, Matthias Althammer, Rudolf Gross, Mathias Weiler
Research Article | IEEE Magnetics Letters 10, 5503905  (2019)
Mikel Sanz, Kirill G. Fedorov, Frank Deppe, Enrique Solano
Research Article | 2018 IEEE Conference on Antenna Measurements Applications (CAMA), Västerås , pp. 1-4  (2018)
Edwar Xie, Frank Deppe, Michael Renger, Daniel Repp, Peter Eder, Michael Fischer, Jan Goetz, Stefan Pogorzalek, Kirill G. Fedorov, Achim Marx, and Rudolf Gross
Research Article | Applied Physics Letters 112, 202601  (2018)
Jan Goetz, Frank Deppe, Kirill G. Fedorov, Peter Eder, Michael Fischer, Stefan Pogorzalek, Edwar Xie, Achim Marx, Rudolf Gross
Research Article | Physical Review Letters 121, 060503  (2018)
P. Eder, T. Ramos, J. Goetz, M. Fischer, S. Pogorzalek, J. Puertas Martínez, E.P. Menzel, F. Loacker, E. Xie, J.J. Garcia-Ripoll, K.G. Fedorov, A. Marx, F. Deppe, R. Gross
Research Article | Supercond. Sci. Technol. 31, 115002  (2018)
Philip Schmidt, Daniel Schwienbacher, Matthias Pernpeintner, Friedrich Wulschner, Frank Deppe, Achim Marx, Rudolf Gross, Hans Huebl
Research Article | Appl. Phys. Lett. 113, 152601  (2018)
Grant No.
EXC-2111 – 390814868
Funded by
German Research Foundation (DFG)
Funding program
Excellence Strategy
Munich Quantum Valley Quantencomputer Demonstratoren – Supraleitende Qubits (MUNIQC-SC)
Funded by Federal Ministry of Education and Research (BMBF)
Within the project MUNIQC we aim to build a quantum computer demonstrators based on superconducting qubits in close collaboration with the Munich Quantum Valley initiative (MQV). This project is centered on scaling the SC qubits platform, to allow for fast, nanosecond operation timescales on quantum processors based on scalable industry-compatible fabrication technology. In collaboration with partners from research organizations, universities and the commercial sector our goal is to build a demonstrator device with up to 100 qubits to run practical NISQ-type algorithms and to offer both cloud and hybrid HPC/QC access within five years.
Publications
Stefan Filipp (Eds. Alissa Wilm, Florian Neukart)
Book | Springer-Verlag GmbH  (2023)
Superconducting Quantum Local Area Networks (SuperQuLAN)
Funded by European Union (EU)
The SuperQuLAN project addresses the long-term goal of realizing large-scale Quantum Local Area Networks (QuLANs), where many individual superconducting quantum computing modules are linked by coherent quantum communication channels in a modular way. Through this approach, QuLANs can overcome the physical limitations of existing isolated quantum processors by simply integrating multiple processing and storage modules into a cluster of computing devises of increasing size.

Superconducting quantum circuits are one of the most promising platforms for realizing large-scale quantum computing devices, where in the near future a coherent integration of 100-1000 quantum bits (qubits) is feasible. However, the required temperatures of only a few mK currently restrict quantum operations to qubits that are located within a single, heavily shielded dilution refrigerator. This imposes a serious constraint on the realization of even larger quantum processors or the implementation of local- and wide-area quantum networks based on this technology.

The project SuperQuLAN is set out to address this important open problem and to demonstrate a first operational prototype quantum local area network (QuLAN) of separated superconducting quantum processors. This work will be carried out by a multi-national team of scientists and industry partners who will develop key network components and quantum communication protocols that will facilitate in the long term the realization of large quantum computing clusters or even city-wide quantum networks using superconducting circuits.

Publications
Daniele De Bernardis, Francesco Piccioli, Peter Rabl, Iacopo Carusotto
Research Article | Physical Review X Quantum 4, 030306  (2023)
Preprint: arXiv:2302.14863
Rishabh Sahu, Liu Qiu, William Hease, Georg Arnold, Yuri Minoguchi, Peter Rabl, Johannes M. Fink
Research Article | Science 380, 718-721  (2023)
Preprint: arXiv:2301.03315
Ze-Liang Xiang and Diego González Olivares and Juan José García-Ripoll and Peter Rabl
Research Article | Physical Review Letters 130  (2023)
Preprint: arXiv:2209.09396
Contact
Coordinator

Peter Rabl (WMI)
Stephan Schneider (TU Wien)

Grant No.
899354
Funded by
European Union (EU)
Funding program
Horizon 2020, Future and Emerging Technologies (FET) Open
Quantum Microwave Communication and Sensing (QMiCS)
Funded by European Union (EU)
Welcome to QMiCS – a European Quantum Flagship project -- QMiCS sets up a quantum microwave local area network cable over a distance of several meters. We will use this architecture to implement quantum communication protocols such as teleportation between two superconducting quantum nodes. Since our approach does not require any of the notoriously loss‑prone frequency conversion techniques, our platform will be highly beneficial for distributed quantum computing. In addition, we take first steps towards the ambitious goal of radar-style quantum sensing with microwaves. Major milestones here are the implementation of microwave single photon detectors and the development of a roadmap towards commercial applications in later phases of the Flagship.

The mission of QMiCS is to combine European expertise and lead the efforts in developing novel components, experimental techniques, and theory models building on the quantum properties of continuous-variable propagating microwaves.

QMiCS’ long-term visions are (i) distributed quantum computing & communication via microwave quantum local area networks (QLANs) and (ii) sensing applications based on the illumination of an object with quantum microwaves (quantum radar). With respect to key quantum computing platforms (superconducting circuits, NV centers, quantum dots), microwaves intrinsically allow for zero frequency conversion loss since they are the natural frequency scale. They can be distributed via superconducting cables with surprisingly little losses, eventually allowing for quantum communication and cryptography applications.

Radar works at gigahertz frequencies because of the atmospheric transparency windows anyways.

Scientifically, QMiCS targets a QLAN demonstration via quantum teleportation, a quantum advantage in microwave illumination, and a roadmap to real-life applications for the second/third phase of the QT Flagship.

Beneath these three grand goals lies a strong component of disruptive enabling technology provided by two full and one external industry partner: the development of a microwave QLAN cable connecting the millikevin stages of two dilution refrigerators, improved cryogenic semiconductor amplifiers, and packaged pre-quantum ultrasensitive microwave detectors.

The resulting “enabling” commercial products are beneficial for quantum technologies at microwave frequencies in general.

Finally, QMiCS fosters awareness in industry about the revolutionary business potential of quantum microwave technologies, especially via the advisory third parties “Airbus Defence and Space Ltd” and “Cisco Systems GmbH”. In this way, QMiCS helps placing Europe at the forefront of the second quantum revolution and kick-starting a competitive European quantum industry.

This project has received funding from the European Union’s Horizon 2020 research and innovation programme under grant No 820505.

Publications
M. Renger, S. Gandorfer, W. Yam, F. Fesquet, M. Handschuh, K. E. Honasoge, F. Kronowetter, Y. Nojiri, M. Partanen, M. Pfeiffer, H. van der Vliet, A. J. Matthews, J. Govenius, R. N. Jabdaraghi, M. Prunnila, A. Marx, F. Deppe, R. Gross, K. G. Fedorov
Research Article | arXiv:2308.12398
Florian Fesquet, Fabian Kronowetter, Michael Renger, Qiming Chen, Kedar Honasoge, Oscar Gargiulo, Yuki Nojiri, Achim Marx, Frank Deppe, Rudolf Gross, Kirill G. Fedorov
Research Article | Physical Review A 108, 032607  (2023)
Preprint: arXiv:2203.05530
Giulio Terrasanta, Timo Sommer, Manuel Müller, Matthias Althammer, Rudolf Gross, Menno Poot
Research Article | Optics Express 30, 8537-8549  (2022)
Preprint: arXiv:2110.01993
M. Renger, S. Pogorzalek, F. Fesquet, K. Honasoge, F. Kronowetter, Q. Chen, Y. Nojiri, K. Inomata, Y. Nakamura, A. Marx, F. Deppe, R. Gross, K. G. Fedorov
Research Article | Physical Review A 106, 052415  (2022)
Preprint: arXiv:2207.06090
Michael Fischer
PHD Thesis | Technical University of Munich  (2022)
Qi-Ming Chen
PHD Thesis | Technical University of Munich  (2022)
Philipp Krüger
Master Thesis | Technische Universität München  (2022)
Qi-Ming Chen, Meike Pfeiffer, Matti Partanen, Florian Fesquet, Kedar E. Honasoge, Fabian Kronowetter, Yuki Nojiri, Michael Renger, Kirill G. Fedorov, Achim Marx, Frank Deppe, Rudolf Gross
Research Article | Physical Review B 106, 214505  (2022)
Preprint: arXiv:2109.07762
Qi-Ming Chen, Matti Partanen, Florian Fesquet, Kedar E. Honasoge, Fabian Kronowetter, Yuki Nojiri, Michael Renger, Kirill G. Fedorov, Achim Marx, Frank Deppe, Rudolf Gross
Research Article | Physical Review B 106, 214506  (2022)
Preprint: arXiv:2109.07766
Qi-Ming Chen, Florian Fesquet, Kedar E. Honasoge, Fabian Kronowetter, Yuki Nojiri, Michael Renger, Kirill G. Fedorov, Achim Marx, Frank Deppe, Rudolf Gross
Research Article | Physical Review A 105, 012405  (2022)
Preprint: arXiv:2107.01842
M. Renger, S. Pogorzalek, Q. Chen, Y. Nojiri, K. Inomata, Y. Nakamura, M. Partanen, A. Marx, R. Gross, F. Deppe, K. G. Fedorov
Research Article | npj Quantum Information 7, 160  (2021)
Preprint: arXiv:2011.00914
K. G. Fedorov, M. Renger, S. Pogorzalek, R. Di Candia, Q. Chen, Y. Nojiri, K. Inomata, Y. Nakamura, M. Partanen, A. Marx, R. Gross, F. Deppe
Research Article | Science Advances 7, eabk0891  (2021)
Preprint: arXiv:2103.04155
Michael Fischer, Qi-Ming Chen, Christian Besson, Peter Eder, Jan Goetz, Stefan Pogorzalek, Michael Renger, Edwar Xie, Michael J. Hartmann, Kirill G. Fedorov, Achim Marx, Frank Deppe, Rudolf Gross
Research Article | Physical Review B 103, 094515  (2021)
Preprint: arXiv:2009.13492
Frank Deppe, Kirill G. Fedorov, Achim Marx
Other | Akadmie Aktuell (ISSN 1436 -753X), Heft 2 (74), 36-38  (2021)
F. Deppe, Edwar Xie, K.G. Fedorov, G. Andersson, J. Müller, A. Marx, R. Gross
Research Article | 2021 International Applied Computational Electromagnetics Society Symposium (ACES), IEEE Xplore , pp. 1-4  (2021)
Pogorzalek, Stefan
PHD Thesis | Technische Universität München  (2020)
Qi-Ming Chen, Frank Deppe, Re-Bing Wu, Luyan Sun, Yu-xi Liu, Yuki Nojiri, Stefan Pogorzalek, Michael Renger, Matti Partanen, Kirill G. Fedorov, Achim Marx, Rudolf Gross
Research Article | arXiv:1912.09861
S. Pogorzalek, K. G. Fedorov, M. Xu, A. Parra-Rodriguez, M. Sanz, M. Fischer, E. Xie, K. Inomata, Y. Nakamura, E. Solano, A. Marx, F. Deppe, R. Gross
Research Article | Nature Communications 10, 2604  (2019)
Mikel Sanz, Kirill G. Fedorov, Frank Deppe, Enrique Solano
Research Article | 2018 IEEE Conference on Antenna Measurements Applications (CAMA), Västerås , pp. 1-4  (2018)
Edwar Xie, Frank Deppe, Michael Renger, Daniel Repp, Peter Eder, Michael Fischer, Jan Goetz, Stefan Pogorzalek, Kirill G. Fedorov, Achim Marx, and Rudolf Gross
Research Article | Applied Physics Letters 112, 202601  (2018)
P. Eder, T. Ramos, J. Goetz, M. Fischer, S. Pogorzalek, J. Puertas Martínez, E.P. Menzel, F. Loacker, E. Xie, J.J. Garcia-Ripoll, K.G. Fedorov, A. Marx, F. Deppe, R. Gross
Research Article | Supercond. Sci. Technol. 31, 115002  (2018)
Coordinator

Frank Deppe

Grant No.
H2020.820505
Funded by
European Union (EU)
Funding program
Quantum Flagship
Microwave Quantum Tokens in Electronic and Nuclear Spin Ensembles (QuaMToMe)
Funded by Federal Ministry of Education and Research (BMBF)
Quantum communication is expected to become an important building block of the secure digital infrastructure in our future society. In quantum communication, the exchange of unconditionally secure cryptographic keys is based on fundamental physical laws. In addition to secure data transmission, quantum communication offers new possibilities for secure user authentication enabled by the concepts of quantum tokens. Analogous to today's common security tokens, such as bank cards, transponders or transaction numbers, quantum tokens can be used to validate various forms of communication, while being unconditionally secure against eavesdropping. In order to implement microwave quantum tokens it is required to develop several key building blocks: reliable routines and devices for their generation and long-lived scalable quantum memories for their storage. The aforementioned two tasks are central goals of the current project.

The core objective of this collaborative project is the realization, investigation and demonstration of quantum tokens (Q-tokens) in the microwave or GHz frequency range. The quantum tokens will be implemented in the form of quantum keys stored in quantum memories based on spin ensembles. In general, scalable and long-lived quantum memories represent one of the missing elements needed to build local microwave-based quantum networks. Quantum tokens in the form of propagating squeezed states represent a particularly important use case for such quantum networks.

To achieve our ambitious goals, we identify the following work packages which correspond to individual sub-projects within WMI:

  • Experimental realization, characterization and optimization of Q-token generation using time and frequency multiplexing techniques (PI: Kirill Fedorov).
  • Experimental realization, characterization and improvement of a rare-earth spin-based microwave quantum memory, including storage and retrieval of generated Q-tokens encoded in frequency domain (PI: Nadezhda Kukharchyk).
  • Experimental realization, characterization and improvement of a microwave quantum memory based on phosphorous donors in silicon, including storage and retrieval of generated Q-tokens encoded in time-domain (PI: Hans Hübl).

The generation of Q-tokens in the GHz-frequency range can be achieved by exploiting displaced squeezed states. The latter are generated with the help of superconducting Josephson parametric amplifiers. The actual quantum memories are realized with spin ensembles having transition frequencies in the GHz range. They will be realized by two approaches: the storage of keys in (i) the rare-earth ion system 167Er:Y2SiO5, and (ii) in the isotopically-purified 28Si:P donor system coupled to a microwave resonator. These different spin systems have mutually exclusive advantages, and therefore, both will have useful applications in certain quantum communication scenarios.

Achieving our key goals will require a close coordination between the sub-projects by combining those into final joint experiments towards successful storage of microwave Q-Tokens in quantum spin memories.

Publications
F. Kronowetter, M. Würth, W. Utschick, R. Gross, K. G. Fedorov
Research Article | arXiv:2308.02343
Florian Fesquet, Fabian Kronowetter, Michael Renger, Qiming Chen, Kedar Honasoge, Oscar Gargiulo, Yuki Nojiri, Achim Marx, Frank Deppe, Rudolf Gross, Kirill G. Fedorov
Research Article | Physical Review A 108, 032607  (2023)
Preprint: arXiv:2203.05530
F. Kronowetter, F. Fesquet, M. Renger, K. Honasoge, Y. Nojiri, K. Inomata, Y. Nakamura, A. Marx, R. Gross, K. G. Fedorov
Research Article | Physical Review Applied 20, 024049  (2023)
Preprint: arXiv:2303.01026
Coordinator

Dr. Nadezhda Kukharchyk (WMI)

Grant No.
16KISQ036
Funded by
Federal Ministry of Education and Research (BMBF)
Funding program
Vernetzung und Sicherheit digitaler Systeme: Grand Challenge der Quantenkommunikation
Parametric Multi-Qubit Gates (QUSTEC)
Funded by European Union (EU)
This project explores the potential of multi-qubit gates for quantum computing on a superconducting qubit platform. The main goal is to develop superconducting architectures and control methods to efficiently generate multi-qubit states going beyond the current paradigm of decomposing all state manipulations into single and two-qubit gates.

We design and realize parametric couplers connecting multiple superconducting qubits and investigate multi-qubit operations that allow us to entangle multiple qubits at the same time. We explore multi-qubit entangling interactions and evaluate the maximally possible number of qubits coupled to a single coupler. We aim to address the question if there is an advantage in using multi-qubit gates over traditional two-qubit gates in practical experiments. The devices and methods developed in this project will enhance the scalability of superconducting qubit platforms and the efficiency of quantum algorithms.

Publications
Aneirin J. Baker, Gerhard B. P. Huber, Niklas J. Glaser, Federico Roy, Ivan Tsitsilin, Stefan Filipp and Michael J. Hartmann
Research Article | Applied Physics Letters 120  (2022)
Preprint: arXiv:2111.05938
Contact
Coordinator

Prof. Guido Pupillo, Univ. Strasbourg

Grant No.
H2020.Cofund.847471
Funded by
European Union (EU)
Funding program
Marie Skłodowska-Curie Action (MSCA), Quantum Science and Technologies at the European Campus (QUSTEC)
Quantum Radar Team (QUARATE)
Funded by Federal Ministry of Education and Research (BMBF)
Klassische Radartechnologien (in Luft‐ und Raumfahrt, Messtechnik oder autonomes Fahren) stoßen bereits heute an ihre physikalischen Grenzen, hauptsächlich limitiert durch das Rauschen in der Umgebung. Ab einem gewissen Signal‐zu‐Rausch‐Verhältnis (SRV) ist eine Informationsgewinnung mittels herkömmlicher klassischer Mikrowellensignale nicht mehr möglich. Durch die Verwendung von Quantenmikrowellen und die daraus resultierenden neuen Korrelationsmöglichkeiten kann man die Informationsgewinnung jedoch weiter verbessern. Dieser sogenannte Quantenvorteil kann signifikant zur Reichweitensteigerung oder zur Reduktion der Signalleistung beitragen. Eine alternative Technologie zur grundsätzlichen Steigerung des SRV ist derzeit nicht bekannt.

Zunächst soll der Quantenvorteil unter Laborbedingungen (Temperaturen im Bereich von milliKelvin, Vakuum) nachgewiesen werden. Anschließend müssen geeignete Technologien entwickelt werden, um die unter milliKelvin‐Temperaturen erzeugten Quantenmikrowellen auch über Antennen im ungekühlten Freiraum abstrahlen und wieder detektieren zu können. Hierbei gilt ein besonderes Augenmerk der anspruchsvollen Signalverarbeitung. Diese muss auch theoretische Untersuchungen von Faktoren mit technischer Relevanz, z.B. Dekohärenz, beinhalten. Insgesamt ergibt sich daraus eine Roadmap hin zu feldtauglichen Implementierungen, und somit zur kommerziellen Verwertung.

Das Vorhaben bezieht sich auf bereits vorhandene wissenschaftliche Grundlagen. Die Innovation steckt daher vielmehr im Forschungs‐ und‐ Entwicklungsprozess, bei dem Systementwicklungsaufgaben wie Skalierung  und die Bewältigung technologischer Herausforderungen im Vordergrund stehen. Neben dem Know-How zum Quantenradar werden auch ganz allgemein Quantentechnologien mit supraleitenden Schaltkreisen auch in Deutschland nachhaltig etabliert.

Publications
M. Renger, S. Gandorfer, W. Yam, F. Fesquet, M. Handschuh, K. E. Honasoge, F. Kronowetter, Y. Nojiri, M. Partanen, M. Pfeiffer, H. van der Vliet, A. J. Matthews, J. Govenius, R. N. Jabdaraghi, M. Prunnila, A. Marx, F. Deppe, R. Gross, K. G. Fedorov
Research Article | arXiv:2308.12398
F. Kronowetter, M. Würth, W. Utschick, R. Gross, K. G. Fedorov
Research Article | arXiv:2308.02343
S. Gandorfer, M. Renger, W. K. Yam, F. Fesquet, A. Marx, R. Gross, K. G. Fedorov
Research Article | arXiv:2308.02389
Florian Fesquet, Fabian Kronowetter, Michael Renger, Qiming Chen, Kedar Honasoge, Oscar Gargiulo, Yuki Nojiri, Achim Marx, Frank Deppe, Rudolf Gross, Kirill G. Fedorov
Research Article | Physical Review A 108, 032607  (2023)
Preprint: arXiv:2203.05530
Fabian Kronowetter
Research Article | Neues 226, 24-29  (2023)
Rudolf Gross
Research Article | Neues 226, 20-23  (2023)
F. Kronowetter, F. Fesquet, M. Renger, K. Honasoge, Y. Nojiri, K. Inomata, Y. Nakamura, A. Marx, R. Gross, K. G. Fedorov
Research Article | Physical Review Applied 20, 024049  (2023)
Preprint: arXiv:2303.01026
M. Renger, S. Pogorzalek, F. Fesquet, K. Honasoge, F. Kronowetter, Q. Chen, Y. Nojiri, K. Inomata, Y. Nakamura, A. Marx, F. Deppe, R. Gross, K. G. Fedorov
Research Article | Physical Review A 106, 052415  (2022)
Preprint: arXiv:2207.06090
Philipp Krüger
Master Thesis | Technische Universität München  (2022)
Qi-Ming Chen, Meike Pfeiffer, Matti Partanen, Florian Fesquet, Kedar E. Honasoge, Fabian Kronowetter, Yuki Nojiri, Michael Renger, Kirill G. Fedorov, Achim Marx, Frank Deppe, Rudolf Gross
Research Article | Physical Review B 106, 214505  (2022)
Preprint: arXiv:2109.07762
Qi-Ming Chen, Matti Partanen, Florian Fesquet, Kedar E. Honasoge, Fabian Kronowetter, Yuki Nojiri, Michael Renger, Kirill G. Fedorov, Achim Marx, Frank Deppe, Rudolf Gross
Research Article | Physical Review B 106, 214506  (2022)
Preprint: arXiv:2109.07766
Qi-Ming Chen, Florian Fesquet, Kedar E. Honasoge, Fabian Kronowetter, Yuki Nojiri, Michael Renger, Kirill G. Fedorov, Achim Marx, Frank Deppe, Rudolf Gross
Research Article | Physical Review A 105, 012405  (2022)
Preprint: arXiv:2107.01842
K. G. Fedorov, M. Renger, S. Pogorzalek, R. Di Candia, Q. Chen, Y. Nojiri, K. Inomata, Y. Nakamura, M. Partanen, A. Marx, R. Gross, F. Deppe
Research Article | Science Advances 7, eabk0891  (2021)
Preprint: arXiv:2103.04155
F. Deppe, Edwar Xie, K.G. Fedorov, G. Andersson, J. Müller, A. Marx, R. Gross
Research Article | 2021 International Applied Computational Electromagnetics Society Symposium (ACES), IEEE Xplore , pp. 1-4  (2021)
Contact
Coordinator

Dr.-Ing. Baris Güzelarslan
Rohde & Schwarz GmbH & Co. KG
München

Grant No.
13N15380
Funded by
Federal Ministry of Education and Research (BMBF)
Funding program
Anwendungsbezogene Forschung in der Quantensensorik, -metrologie sowie -bildgebung
German Quantum Computer based on Superconducting Qubits (GeQCoS)
Funded by Federal Ministry of Education and Research (BMBF)
Building quantum processor with novel properties based on superconducting qubits - this is the aim of the four year project GeQCoS ('German Quantum Computer based on Superconducting Qubits') funded by the BMBF. In this joint project, Germany's leading scientists in the field of superconducting quantum circuits have teamed up to develop innovative concepts for the construction of an improved quantum processor.

They aim to realize a quantum processor with improved quality based on new materials and manufacturing methods by the Karlsruhe Institute of Technology (KIT), tailor-made theoretical concepts of the Friedrich-Alexander University Erlangen Nürnberg (FAU), optimized control methods of the Forschungszentrum Jülichs (FZJ) and concepts for new architectures with higher connectivity at the Walther-Meißner-Institute (WMI – Bavarian Academy of Sciences and Technical University of Munich). In order to achieve this goal, semiconductor manufacturer Infineon will develop scalable manufacturing processes, while the Fraunhofer Institute for Applied Solid State Physics (IAF) in Freiburg is promoting the development of optimized chip packages. The processor performance will eventually be demonstrated using a specifically developed quantum algorithm at the WMI.

(alter Text:) Die Realisierung von Quantencomputern und die Erzeugung der sog. Quantenbits oder kurz Qubits, die für seine Funktion notwendig sind, ist derzeit eine große Herausforderung. Die damit verbundenen Quantenzustände, sind in der Regel gegenüber äußeren Einflüssen sehr empfindlich und wenig stabil. Das ist derzeit ein großes Hindernis für die praktische Nutzung. Um hier Fortschritte zu erzielen, verfolgen die Partner des Verbundprojektes GEQCOS einen neuen Ansatz, Qubits auf der Basis supraleitender Schaltkreise zu erzeugen. Ziel ist die Realisierung eines Quantenprozessors, an dem sich die Funktionsfähigkeit des gewählten Konzepts zeigen lässt.

Für die Funktion eines Quantencomputers ist die sog. Verschränkung der Qubits notwendig. Dieser Verschränkungszustand ist nur für eine gewisse Zeit, auch Kohärenzzeit genannt, vorhanden. Nur in dieser Zeit kann der Quantencomputer rechnen. Mit dem genannten Ansatz zur Kopplung der Qubits sollen nun effiziente Operationen mit mehreren Qubits durchführbar werden. Gleichzeitig kann die Kohärenzzeit mit diesem Ansatz erhöht werden, um umfangreichere Quantenoperationen als bisher zu ermöglichen. Im Erfolgsfall ist das ein wesentlicher Schritt auf dem Weg zu praxistauglichen Quantencomputern mit einer ausreichenden Anzahl Qubits für die Lösung anwendungsbezogener Problemstellungen.

Publications
Stefan Filipp (Eds. Alissa Wilm, Florian Neukart)
Book | Springer-Verlag GmbH  (2023)
Maximilian Nägele, Christian Schweizer, Federico Roy, Stefan Filipp
Research Article | Physical Review Research 4, 033166  (2022)
Preprint: arXiv:2203.07331
Aneirin J. Baker, Gerhard B. P. Huber, Niklas J. Glaser, Federico Roy, Ivan Tsitsilin, Stefan Filipp and Michael J. Hartmann
Research Article | Applied Physics Letters 120  (2022)
Preprint: arXiv:2111.05938
Stefan Filipp
Other | Akadmie Aktuell (ISSN 1436 -753X), Heft 2 (74), 20-23  (2021)
Contact
Grant No.
13N15680
Funded by
Federal Ministry of Education and Research (BMBF)
Funding program
Quantenprozessoren und Technologien für Quantencomputer
Quantum Neural Networks (Quromorphic)
Funded by European Union (EU)
Artificial neural networks, which simulate the way the human brain analyses and processes information, are used to model complex patterns and prediction problems. This approach typically involves building software rather than creating hardware that mimics neurons. The EU-funded Quromorphic project plans to implement neuromorphic computing on the hardware level. The project aims to build the first dedicated neural network computer that works on quantum mechanics principles. It will be built in hardware made of superconducting electrical circuits. Neuromorphic quantum hardware could possibly outperform classical von Neumann architectures as it can be trained on multiple batches of real-world data in parallel.

The Quromorphic project will introduce human brain inspired hardware with quantum functionalities: It will build superconducting quantum neural networks to develop dedicated, neuromorphic quantum machine learning hardware, which can, in its next generation, outperform classical von Neumann architectures. This approach will combine two cutting edge developments in information processing, machine learning and quantum computing, into a radically new technology. In contrast to established machine learning approaches that emulate neural function in software on conventional von Neumann hardware, neuromorphic quantum hardware can offer a significant advantage as it may offer the possibility to be trained on multiple batches of real world data in parallel. This feature is expected to lead to a quantum advantage. Quromorphic aims to provide proof of concept demonstrations of this new technology and a roadmap for the path towards its exploitation. To achieve this breakthrough, we will implement feed forward networks. This effort will be completed by the development of strategies for scaling the devices to the threshold where they will surpass the capabilities of existing machine learning technology and achieve quantum advantage.

Publications
Marek Pechal, Federico Roy, Samuel A. Wilkinson, Gian Salis, Max Werninghaus, Michael J. Hartmann, Stefan Filipp
Research Article | Physical Review Research 4, 033190  (2022)
Preprint: arXiv:2111.12669
Aneirin J. Baker, Gerhard B. P. Huber, Niklas J. Glaser, Federico Roy, Ivan Tsitsilin, Stefan Filipp and Michael J. Hartmann
Research Article | Applied Physics Letters 120  (2022)
Preprint: arXiv:2111.05938
M. Pechal, G. Salis, M. Ganzhorn, D. J. Egger, M. Werninghaus, and S. Filipp
Research Article | Physical Review X 11, 041032  (2021)
Preprint: arXiv:2011.08987
M. Ganzhorn, G. Salis, D. J. Egger, A. Fuhrer, M. Mergenthaler, C. Müller, P. Müller, S. Paredes, M. Pechal, M. Werninghaus, and S. Filipp
Research Article | Physical Review Research 2, 033447  (2020)
Gian Salis, Nikolaj Moll, Marco Roth, Marc Ganzhorn, and Stefan Filipp
Research Article | Physical Review A 102, 062611  (2020)
Preprint: arXiv:2001.05243
Contact
Coordinator

Michael Hartmann (Univ. Nürnberg-Erlangen)

Grant No.
H2020.828826
Funded by
European Union (EU)
Funding program
Horizon 2020, Future and Emerging Technologies (FET) Open
Quantum Optimal Control (QuSCo)
Funded by European Union (EU)
The primary focus of this project will be on the design, optimal characterization and control of multi-qubit superconducting devices based on transmon qubits in a circuit QED architecture.

We will use measurement in a closed-loop way to optimize the tune-up of the system to obtain high-fidelity quantum gates. The project also addresses the question how to tailor control and measurements of a complex multi-qubit quantum processor in order to obtain targeted information in the most efficient and robust way. We will develop the tools to make best use of the retrievable information in our measurements, including statistical accuracies, backgrounds and imperfections, to find an optimal model of the system by comparing experimentally measured results with numerical/analytical predictions. The project is part of the EU training network QuSCo in which we are closely collaborating with the group of Frank Wilhelm-Mauch.

Publications
Marek Pechal, Federico Roy, Samuel A. Wilkinson, Gian Salis, Max Werninghaus, Michael J. Hartmann, Stefan Filipp
Research Article | Physical Review Research 4, 033190  (2022)
Preprint: arXiv:2111.12669
Maximilian Nägele, Christian Schweizer, Federico Roy, Stefan Filipp
Research Article | Physical Review Research 4, 033166  (2022)
Preprint: arXiv:2203.07331
Christiane P. Koch, Ugo Boscain, Tommaso Calarco, Gunther Dirr, Stefan Filipp, Steffen J. Glaser, Ronnie Kosloff, Simone Montangero, Thomas Schulte-Herbrüggen, Dominique Sugny, Frank K. Wilhelm
Research Article | EPJ Quantum Technology 9, 19  (2022)
M. Pechal, G. Salis, M. Ganzhorn, D. J. Egger, M. Werninghaus, and S. Filipp
Research Article | Physical Review X 11, 041032  (2021)
Preprint: arXiv:2011.08987
Max Werninghaus and Daniel Egger and Stefan Filipp
Research Article | Physical Review X Quantum 2, 020324  (2021)
Preprint: arXiv:2010.06576
Nicolas Wittler and Federico Roy and Kevin Pack and Max Werninghaus and Anurag Saha Roy and Daniel J. Egger and Stefan Filipp and Frank K. Wilhelm and Shai Machnes
Research Article | Physical Review Applied 15, 034080  (2021)
Preprint: arXiv:2009.09866
Max Werninghaus and Daniel J Egger and Federico Roy and Shai Machnes and Frank K Wilhelm and Stefan Filipp
Research Article | npj Quantum Information 7, 14  (2021)
Preprint: arXiv:2003.05952
M. Ganzhorn, G. Salis, D. J. Egger, A. Fuhrer, M. Mergenthaler, C. Müller, P. Müller, S. Paredes, M. Pechal, M. Werninghaus, and S. Filipp
Research Article | Physical Review Research 2, 033447  (2020)
Contact
Grant No.
H2020.765267
Funded by
European Union (EU)
Funding program
Marie Skłodowska-Curie Actions (MCSA), Innovative Training Networks (ITN)
Molecular Quantum Simulations (MOQS)
Funded by European Union (EU)
The scientific goals of MOQS are to perform experimental and theoretical quantum simulations of comparatively complex molecular structures as well as electron and energy transfer in molecular complexes. To deliver this, we first make the key transition from traditional theoretical quantum chemistry software (such as q. Monte-Carlo, Hartree-Fock, etc.) to intrinsically quantum software that can be incorporated into our superconducting circuit and Rydberg architectures.

We will tackle two sets of problems: (1) molecular structure computations of small molecular compounds and (2) excitation transfer dynamics in molecular complexes. Within this project  we will design and implement optimal algorithms that exploit quantum resources to solve chemistry problems.

Contact
Grant No.
ITN.955479
Funded by
European Union (EU)
Funding program
Marie Skłodowska-Curie Actions (MCSA), Innovative Training Networks (ITN)
Magnetomechanical Platforms for Quantum Experiments and Quantum Enabled Sensing Technologies (MagQSens)
Funded by European Union (EU)
This project seeks to establish a radically new technology platform for experiments in macroscopic quantum physics and for quantum enabled sensing. We exploit magnetic coupling between superconducting quantum circuits and superconducting mechanical resonators – both levitated and suspended – to enter a hitherto inaccessible parameter regime of both unprecedented force sensitivity and full quantum control of massive, macroscopic objects.

Our approach combines, in a new way, techniques from different research areas (magnetic levitation, superconducting circuits, atom-chip technology, cavity optomechanics and quantum optics) and is set up as a joint collaborative effort between expert European teams from academia and industry. Our technology will enable quantum experiments of otherwise unachievable coherence times and masses, which has immediate implications for testing fundamental physical questions, for performing hybrid quantum information processing and, on the applied side, for ultrasensitive force sensing applications.

Publications
Joachim Hofer, Rudolf Gross, Gerard Higgins, Hans Huebl, Oliver F. Kieler, Reinhold Kleiner, Dieter Koelle, Philip Schmidt, Joshua A. Slater, Michael Trupke, Kevin Uhl, Thomas Weimann, Witlef Wieczorek, Markus Aspelmeyer
Research Article | Physical Review Letters 131, 043603  (2023)
Preprint: arXiv:2211.06289
Thomas Luschmann, Alexander Jung, Stephan Geprägs, Franz X. Haslbeck, Achim Marx, Stefan Filipp, Simon Gröblacher, Rudolf Gross, Hans Huebl
Research Article | Materials for Quantum Technology 3, 021001  (2023)
Preprint: arXiv:2301.11213
Thomas Luschmann, Philip Schmidt, Frank Deppe, Achim Marx, Alvaro Sanchez, Rudolf Gross, Hans Huebl
Research Article | Scientific Reports 12, 1608  (2022)
Preprint: arXiv:2104.10577
Schwienbacher, Daniel
PHD Thesis | Technische Universität München  (2021)
Daniel Schwienbacher, Thomas Luschmann, Rudolf Gross, Hans Huebl
Research Article | arXiv:2011.08080
Philip Schmidt, Mohammad T. Amawi, Stefan Pogorzalek, Frank Deppe, Achim Marx, Rudolf Gross, Hans Huebl
Research Article | Communications Physics 3, 233  (2020)
Preprint: arXiv:1912.08731
Weichselbaumer, Stefan
PHD Thesis | Technische Universität München  (2020)
Daniel Schwienbacher, Matthias Pernpeintner, Lukas Liensberger, Eric R. J. Edwards, Hans T. Nembach, Justin M. Shaw, Mathias Weiler, Rudolf Gross, Hans Huebl
Research Article | Journal of Applied Physics 126, 103902  (2019)
Matthias Pernpeintner, Philip Schmidt, Daniel Schwienbacher, Rudolf Gross, Hans Huebl
Research Article | Physical Review Applied 10, 034007115002  (2018)
Philip Schmidt, Daniel Schwienbacher, Matthias Pernpeintner, Friedrich Wulschner, Frank Deppe, Achim Marx, Rudolf Gross, Hans Huebl
Research Article | Appl. Phys. Lett. 113, 152601  (2018)
Matthias Pernpeintner, Rasmus B. Holländer, Maximilian J. Seitner, Eva M. Weig, Rudolf Gross, Sebastian T. B. Goennenwein, Hans Huebl
Research Article | Journal of Applied Physics 119, 093901  (2016)
Coordinator

Markus Aspelmeyer (U Vienna)

Grant No.
H2020.736943
Funded by
European Union (EU)
Funding program
Horizon 2020, Future and Emerging Technologies (FET) Open
International Max Planck Research School "Quantum Science and Technology" (IMPRS-QST)
Funded by Max Planck Society
Quantum science and technology is a vibrant and multidisciplinary field of research at the interface of physics, mathematics, computer science and material science. With over twenty experimental and theoretical research groups, Munich is one of the leading research centres in this field. Our international graduate program unites the competences of these research groups in Munich to a common research and teaching plattform, thus offering doctoral students exiting opportunities and exceptionally broad, yet focused training at the highest level.

The International Max Planck Research School for Quantum Science and Technology is a joint program of the Max Planck Institute of Quantum Optics, the Ludwig-Maximilians-Universität München and the Technical University of Munich. It offers an excellent and coherent graduate program across the fields of atomic physics, quantum optics, solid state physics, material science, quantum information theory, and quantum many-body systems.

First and foremost, IMPRS-QST provides a platform of joint activities for a large research community, encouraging better networking and scientific exchange as an integral part of doctoral training.

IMPRS-QST students can either get directly admitted to the program through our yearly application process or join as members after starting their PhD at one of our associated research groups. 

Publications
S. Gandorfer, M. Renger, W. K. Yam, F. Fesquet, A. Marx, R. Gross, K. G. Fedorov
Research Article | arXiv:2308.02389
Contact
Coordinator

Ignacio Cirac (MPQ, TUM)

Funded by
Max Planck Society
Funding program
International Max Planck Research School (IMPRS)
Munich Quantum Center (MQC)
Funded by German Research Foundation (DFG)
The Munich Quantum Center (MQC) is a virtual center promoting quantum science and technology in the greater Munich area. Within the MQC, mathematicians, theoretical and experimental physicists as well as engineers and materials scientists analyze physical systems exhibiting intriguing quantum mechanical properties and design new methods and materials for leveraging and controlling such systems, thus paving the way for the development of quantum technologies.

In the greater Munich area there is an extremely active cluster of institutions and research centers committed to the highest standards of excellence in research and teaching in the field of quantum science and technology.

The members and principal investigators of the Munich Quantum Center (MQC) research groups meet up regularly at common workshops and seminars to create a very interactive ambience for quantum science in Munich. The MQC was born at the heart of this vivid atmosphere, gathering over 50 research groups belonging to four different institutions: the Ludwig-Maximilians-Universität München, the Technical University of Munich, the Max Planck Institute of Quantum Optics, and the Walther-Meißner-Institute for Low Temperature Research.

Our research covers a wide array of topics ranging from mathematical foundations, quantum information, computational methods, quantum nano-systems, quantum optics, and quantum many-body physics to superconducting quantum devices.

Publications
Manuel Müller, Johannes Weber, Fabian Engelhardt, Victor A. S. V. Bittencourt, Thomas Luschmann, Mikhail Cherkasskii, Sebastian T.B. Goennenwein, Silvia Viola Kusminskiy, Stephan Geprägs, Rudolf Gross, Matthias Althammer, Hans Huebl
Research Article | arXiv:2303.08429
M. Renger, S. Gandorfer, W. Yam, F. Fesquet, M. Handschuh, K. E. Honasoge, F. Kronowetter, Y. Nojiri, M. Partanen, M. Pfeiffer, H. van der Vliet, A. J. Matthews, J. Govenius, R. N. Jabdaraghi, M. Prunnila, A. Marx, F. Deppe, R. Gross, K. G. Fedorov
Research Article | arXiv:2308.12398
F. Kronowetter, M. Würth, W. Utschick, R. Gross, K. G. Fedorov
Research Article | arXiv:2308.02343
S. Gandorfer, M. Renger, W. K. Yam, F. Fesquet, A. Marx, R. Gross, K. G. Fedorov
Research Article | arXiv:2308.02389
Monika Scheufele, Janine Gückelhorn, Matthias Opel, Akashdeep Kamra, Hans Huebl, Rudolf Gross, Stephan Geprägs, Matthias Althammer
Research Article | APL Materials 11, 091115  (2023)
Preprint: arXiv:2306.00375
Rasmus Flaschmann, Christian Schmid, Lucio Zugliani, Stefan Strohauer, Fabian Wietschorke, Stefanie Grotowski, Björn Jonas, Manuel Müller, Matthias Althammer, Rudolf Gross, Jonathan J. Finley, Kai Müller
Research Article | Materials for Quantum Technology 3, 035002  (2023)
Florian Fesquet, Fabian Kronowetter, Michael Renger, Qiming Chen, Kedar Honasoge, Oscar Gargiulo, Yuki Nojiri, Achim Marx, Frank Deppe, Rudolf Gross, Kirill G. Fedorov
Research Article | Physical Review A 108, 032607  (2023)
Preprint: arXiv:2203.05530
Stefan Filipp (Eds. Alissa Wilm, Florian Neukart)
Book | Springer-Verlag GmbH  (2023)
Qi-Ming Chen, Michael Fischer, Yuki Nojiri, Michael Renger, Edwar Xie, Matti Partanen, Stefan Pogorzalek, Kirill G. Fedorov, Achim Marx, Frank Deppe, Rudolf Gross
Research Article | Nature Communications 14, 2896  (2023)
Preprint: arXiv:2206.06338
Giulio Terrasanta, Timo Sommer, Manuel Müller, Matthias Althammer, Rudolf Gross, Menno Poot
Research Article | Optics Express 30, 8537-8549  (2022)
Preprint: arXiv:2110.01993
Michael Fischer
PHD Thesis | Technical University of Munich  (2022)
Manuel Müller, Thomas Luschmann, Andreas Faltermeier, Stefan Weichselbaumer, Leon Koch, Gerhard B. P. Huber, Hans Werner Schumacher, Niels Ubbelohde, David Reifert, Thomas Scheller, Frank Deppe, Achim Marx, Stefan Filipp, Matthias Althammer, Rudolf Gross, Hans Huebl
Research Article | Materials for Quantum Technology 2, 015002  (2022)
Preprint: arXiv:2112.08296
Thomas Luschmann, Philip Schmidt, Frank Deppe, Achim Marx, Alvaro Sanchez, Rudolf Gross, Hans Huebl
Research Article | Scientific Reports 12, 1608  (2022)
Preprint: arXiv:2104.10577
Peter Eder
PHD Thesis | Technical University of Munich  (2022)
Philipp Krüger
Master Thesis | Technische Universität München  (2022)
Qi-Ming Chen, Meike Pfeiffer, Matti Partanen, Florian Fesquet, Kedar E. Honasoge, Fabian Kronowetter, Yuki Nojiri, Michael Renger, Kirill G. Fedorov, Achim Marx, Frank Deppe, Rudolf Gross
Research Article | Physical Review B 106, 214505  (2022)
Preprint: arXiv:2109.07762
Qi-Ming Chen, Matti Partanen, Florian Fesquet, Kedar E. Honasoge, Fabian Kronowetter, Yuki Nojiri, Michael Renger, Kirill G. Fedorov, Achim Marx, Frank Deppe, Rudolf Gross
Research Article | Physical Review B 106, 214506  (2022)
Preprint: arXiv:2109.07766
Qi-Ming Chen, Florian Fesquet, Kedar E. Honasoge, Fabian Kronowetter, Yuki Nojiri, Michael Renger, Kirill G. Fedorov, Achim Marx, Frank Deppe, Rudolf Gross
Research Article | Physical Review A 105, 012405  (2022)
Preprint: arXiv:2107.01842
Tobias Wimmer
PHD Thesis | Technical University of Munich  (2021)
Schwienbacher, Daniel
PHD Thesis | Technische Universität München  (2021)
Christopher Waas
Master Thesis | Technische Universität München  (2021)
K. G. Fedorov, M. Renger, S. Pogorzalek, R. Di Candia, Q. Chen, Y. Nojiri, K. Inomata, Y. Nakamura, M. Partanen, A. Marx, R. Gross, F. Deppe
Research Article | Science Advances 7, eabk0891  (2021)
Preprint: arXiv:2103.04155
Patrick Missale
Bachelor Thesis | Technische Universität München  (2021)
Christoph Scheuer
Master Thesis | Technische Universität München  (2021)
Rudolf Gross
Other | Akadmie Aktuell (ISSN 1436 -753X), Heft 2 (74), 14-19  (2021)
G. Terrasanta, M. Müller, T. Sommer, S. Geprägs, R. Gross, M. Althammer, M. Poot
Research Article | Materials for Quantum Technology 1, 021002  (2021)
Preprint: arXiv:2103.08318
Manuel Müller, Raphael Hoepfl, Lukas Liensberger, Stephan Geprägs, Hans Huebl, Mathias Weiler, Rudolf Gross, Matthias Althammer
Research Article | Materials for Quantum Technology 1, 045001  (2021)
Preprint: arXiv:2102.09018
Frank Deppe, Kirill G. Fedorov, Achim Marx
Other | Akadmie Aktuell (ISSN 1436 -753X), Heft 2 (74), 36-38  (2021)
Hans Huebl
Other | Akadmie Aktuell (ISSN 1436 -753X), Heft 2 (74), 32-35  (2021)
Stefan Filipp
Other | Akadmie Aktuell (ISSN 1436 -753X), Heft 2 (74), 20-23  (2021)
Aristo Kevin Ardyaneira P
Bachelor Thesis | Technische Universität München  (2021)
Florian Fesquet
Master Thesis | Technische Universität München  (2020)
Julia Lamprich
Master Thesis | Technische Universität München  (2020)
Stephan Trattnig
Master Thesis | Technische Universität München  (2020)
Pogorzalek, Stefan
PHD Thesis | Technische Universität München  (2020)
S. Pogorzalek, K. G. Fedorov, M. Xu, A. Parra-Rodriguez, M. Sanz, M. Fischer, E. Xie, K. Inomata, Y. Nakamura, E. Solano, A. Marx, F. Deppe, R. Gross
Research Article | Nature Communications 10, 2604  (2019)
Mikel Sanz, Kirill G. Fedorov, Frank Deppe, Enrique Solano
Research Article | 2018 IEEE Conference on Antenna Measurements Applications (CAMA), Västerås , pp. 1-4  (2018)
Edwar Xie, Frank Deppe, Michael Renger, Daniel Repp, Peter Eder, Michael Fischer, Jan Goetz, Stefan Pogorzalek, Kirill G. Fedorov, Achim Marx, and Rudolf Gross
Research Article | Applied Physics Letters 112, 202601  (2018)
Kirill G. Fedorov, S. Pogorzalek, U. Las Heras, M. Sanz, P. Yard, P. Eder, M. Fischer, J. Goetz, E. Xie, K. Inomata, Y. Nakamura, R. Di Candia, E. Solano, A. Marx, F. Deppe, R. Gross
Research Article | Scientific Reports 8, 6416  (2018)
Matthias Pernpeintner, Philip Schmidt, Daniel Schwienbacher, Rudolf Gross, Hans Huebl
Research Article | Physical Review Applied 10, 034007115002  (2018)
Jan Goetz, Frank Deppe, Kirill G. Fedorov, Peter Eder, Michael Fischer, Stefan Pogorzalek, Edwar Xie, Achim Marx, Rudolf Gross
Research Article | Physical Review Letters 121, 060503  (2018)
P. Eder, T. Ramos, J. Goetz, M. Fischer, S. Pogorzalek, J. Puertas Martínez, E.P. Menzel, F. Loacker, E. Xie, J.J. Garcia-Ripoll, K.G. Fedorov, A. Marx, F. Deppe, R. Gross
Research Article | Supercond. Sci. Technol. 31, 115002  (2018)
Philip Schmidt, Daniel Schwienbacher, Matthias Pernpeintner, Friedrich Wulschner, Frank Deppe, Achim Marx, Rudolf Gross, Hans Huebl
Research Article | Appl. Phys. Lett. 113, 152601  (2018)
Stefan Pogorzalek, Kirill G. Fedorov, Ling Zhong, Jan Goetz, Friedrich Wulschner, Michael Fischer, Peter Eder, Edwar Xie, Kunihiro Inomata, Tsuyoshi Yamamoto, Yasunobu Nakamura, Achim Marx, Frank Deppe, Rudolf Gross
Research Article | Physical Review Applied 8, 024012  (2017)
J. Goetz, S. Pogorzalek, F. Deppe, K. G. Fedorov, P. Eder, M. Fischer, F. Wulschner, E. Xie, A. Marx, R. Gross
Research Article | Physical Review Letters 118, 103602  (2017)
U. Las Heras, R. Di Candia, K. G. Fedorov, F. Deppe, M. Sanz, E. Solano
Research Article | Scientific Reports 7, 9333  (2017)
J. Salmilehto, F. Deppe, M. Di Ventra, M. Sanz, E. Solano
Research Article | Scientific Reports 7, 42044  (2017)
J. Goetz, F. Deppe, P. Eder, M. Fischer, M. Müting, J. P. Martínez, S. Pogorzalek, F. Wulschner, E. Xie, K. G. Fedorov, A. Marx, R. Gross
Research Article | Quantum Sci. Technol. 2, 025002  (2017)
Matthias Pernpeintner, Rasmus B. Holländer, Maximilian J. Seitner, Eva M. Weig, Rudolf Gross, Sebastian T. B. Goennenwein, Hans Huebl
Research Article | Journal of Applied Physics 119, 093901  (2016)
Kirill G. Fedorov, L. Zhong, S. Pogorzalek, P. Eder, M. Fischer, J. Goetz, E. Xie, F. Wulschner, K. Inomata, T. Yamamoto, Y. Nakamura, R. Di Candia, U. Las Heras, M. Sanz, E. Solano, E. P. Menzel, F. Deppe, A. Marx, R. Gross
Research Article | Physical Review Letters 117, 020502  (2016)
J. Goetz, F. Deppe, M. Haeberlein, F. Wulschner, C. W. Zollitsch, S. Meier, M. Fischer, P. Eder, E. Xie, K. G. Fedorov, E. P. Menzel, A. Marx, and R. Gross
Research Article | Journal of Applied Physics 119, 015304  (2016)
F. Wulschner, J. Goetz, F. R. Koessel, E. Hoffmann, A. Baust, P. Eder, M. Fischer, M. Haeberlein, M. J. Schwarz, M. Pernpeintner, E. Xie, L. Zhong, C. W. Zollitsch, B. Peropadre, J.-J. Garcia Ripoll, E. Solano, K. Fedorov, E. P. Menzel, F. Deppe, A. Marx, R. Gross
Research Article | EPJ Quantum Technology 3, 10  (2016)
A. Baust, E. Hoffmann, M. Haeberlein, M. J. Schwarz, P. Eder, J. Goetz, F. Wulschner, E. Xie, L. Zhong, F. Quijandria, D. Zueco, J.-J. Garcia Ripoll, L. Garcia-Alvarez, G. Romero, E. Solano, K. G. Fedorov, E. P. Menzel, F. Deppe, A. Marx, R. Gross
Research Article | Physical Review B 93, 214501  (2016)
Max Haeberlein, Frank Deppe, Andreas Kurcz, Jan Goetz, Alexander Baust, Peter Eder, Kirill Fedorov, Michael Fischer, Edwin P. Menzel, Manuel J. Schwarz, Friedrich Wulschner, Edwar Xie, Ling Zhong, Enrique Solano, Achim Marx, Juan-José García-Ripoll, Rudolf Gross
Research Article | arXiv:1506.09114
R. Di Candia, K. G. Fedorov, L. Zhong, S. Felicetti, E. P. Menzel, M. Sanz, F. Deppe, A. Marx, R. Gross, E. Solano
Research Article | EPJ Quantum Technology 2, 25  (2015)
Contact
Coordinator

Tatjana Wilk, LMU München

Funded by
German Research Foundation (DFG)
Funding program
Excellence Strategy
Exploring Quantum Matter (ExQM)
Funded by Free State of Bavaria
ExQM is an international and interdisciplinary PhD programme of excellence based in Munich and jointly held by various quantum physics and mathematical research groups at Technical University of Munich (TUM), Ludwig-Maximilians-Universität Munich (LMU), the Max-Planck-Institute for Quantum Optics (MPQ), the Walther-Meißner Institute of Low-Temperature Research (WMI) and the Walter-Schottky Institute for Quantum Electronics (WSI).

The international doctoral school Exploring Quantum Matter (ExQM) focusses on a topic of growing impact on future technologies as is also reflected by the emerging EU Flagship on Quantum Science. In view of quantum-enabled technologies, the near future promises significant progress in insight into superconductivity, quantum phase transitions, quantum time-evolutions, design of quantum materials, quantum interfaces and integrated circuits thus attracting best students. A key step in this direction is simulating many-body quantum systems (with large-scale correlations) in the lab. A teaching goal is to unite the unique competences of quantum physics in Munich and extend them into an international excellence network of doctoral training centres with partners at the Austrian Academy of Science in Vienna and Innsbruck, at ETH Zurich, ICFO Barcelona, Imperial College London, Caltech, Harvard and others. In a novel format, students receive training specifically tailored to the needs of next generation scientists. New media are systematically used in the curriculum for building up an international e-library of tutorials and seminars (video recordings, some of which shall ultimately be made available as apps or itunesU).

The programme of ExQM is organised in different Research Focus Areas centred on quantum optics, numerical tensor network methods and the study of open quantum systems. ExQM is in close collaboration with the Munich Quantum Centre as well as the IMPRS doctoral school QST all within the DFG-funded excellence cluster Munich Centre for Quantum Science and Technology (MCQST).

Publications
Qi-Ming Chen, Michael Fischer, Yuki Nojiri, Michael Renger, Edwar Xie, Matti Partanen, Stefan Pogorzalek, Kirill G. Fedorov, Achim Marx, Frank Deppe, Rudolf Gross
Research Article | Nature Communications 14, 2896  (2023)
Preprint: arXiv:2206.06338
Michael Fischer
PHD Thesis | Technical University of Munich  (2022)
Peter Eder
PHD Thesis | Technical University of Munich  (2022)
Qi-Ming Chen
PHD Thesis | Technical University of Munich  (2022)
Qi-Ming Chen, Meike Pfeiffer, Matti Partanen, Florian Fesquet, Kedar E. Honasoge, Fabian Kronowetter, Yuki Nojiri, Michael Renger, Kirill G. Fedorov, Achim Marx, Frank Deppe, Rudolf Gross
Research Article | Physical Review B 106, 214505  (2022)
Preprint: arXiv:2109.07762
Qi-Ming Chen, Matti Partanen, Florian Fesquet, Kedar E. Honasoge, Fabian Kronowetter, Yuki Nojiri, Michael Renger, Kirill G. Fedorov, Achim Marx, Frank Deppe, Rudolf Gross
Research Article | Physical Review B 106, 214506  (2022)
Preprint: arXiv:2109.07766
Qi-Ming Chen, Florian Fesquet, Kedar E. Honasoge, Fabian Kronowetter, Yuki Nojiri, Michael Renger, Kirill G. Fedorov, Achim Marx, Frank Deppe, Rudolf Gross
Research Article | Physical Review A 105, 012405  (2022)
Preprint: arXiv:2107.01842
M. Renger, S. Pogorzalek, Q. Chen, Y. Nojiri, K. Inomata, Y. Nakamura, M. Partanen, A. Marx, R. Gross, F. Deppe, K. G. Fedorov
Research Article | npj Quantum Information 7, 160  (2021)
Preprint: arXiv:2011.00914
K. G. Fedorov, M. Renger, S. Pogorzalek, R. Di Candia, Q. Chen, Y. Nojiri, K. Inomata, Y. Nakamura, M. Partanen, A. Marx, R. Gross, F. Deppe
Research Article | Science Advances 7, eabk0891  (2021)
Preprint: arXiv:2103.04155
Michael Fischer, Qi-Ming Chen, Christian Besson, Peter Eder, Jan Goetz, Stefan Pogorzalek, Michael Renger, Edwar Xie, Michael J. Hartmann, Kirill G. Fedorov, Achim Marx, Frank Deppe, Rudolf Gross
Research Article | Physical Review B 103, 094515  (2021)
Preprint: arXiv:2009.13492
Qi-Ming Chen, Frank Deppe, Re-Bing Wu, Luyan Sun, Yu-xi Liu, Yuki Nojiri, Stefan Pogorzalek, Michael Renger, Matti Partanen, Kirill G. Fedorov, Achim Marx, Rudolf Gross
Research Article | arXiv:1912.09861
S. Pogorzalek, K. G. Fedorov, M. Xu, A. Parra-Rodriguez, M. Sanz, M. Fischer, E. Xie, K. Inomata, Y. Nakamura, E. Solano, A. Marx, F. Deppe, R. Gross
Research Article | Nature Communications 10, 2604  (2019)
Edwar Xie, Frank Deppe, Michael Renger, Daniel Repp, Peter Eder, Michael Fischer, Jan Goetz, Stefan Pogorzalek, Kirill G. Fedorov, Achim Marx, and Rudolf Gross
Research Article | Applied Physics Letters 112, 202601  (2018)
Kirill G. Fedorov, S. Pogorzalek, U. Las Heras, M. Sanz, P. Yard, P. Eder, M. Fischer, J. Goetz, E. Xie, K. Inomata, Y. Nakamura, R. Di Candia, E. Solano, A. Marx, F. Deppe, R. Gross
Research Article | Scientific Reports 8, 6416  (2018)
Jan Goetz, Frank Deppe, Kirill G. Fedorov, Peter Eder, Michael Fischer, Stefan Pogorzalek, Edwar Xie, Achim Marx, Rudolf Gross
Research Article | Physical Review Letters 121, 060503  (2018)
P. Eder, T. Ramos, J. Goetz, M. Fischer, S. Pogorzalek, J. Puertas Martínez, E.P. Menzel, F. Loacker, E. Xie, J.J. Garcia-Ripoll, K.G. Fedorov, A. Marx, F. Deppe, R. Gross
Research Article | Supercond. Sci. Technol. 31, 115002  (2018)
Stefan Pogorzalek, Kirill G. Fedorov, Ling Zhong, Jan Goetz, Friedrich Wulschner, Michael Fischer, Peter Eder, Edwar Xie, Kunihiro Inomata, Tsuyoshi Yamamoto, Yasunobu Nakamura, Achim Marx, Frank Deppe, Rudolf Gross
Research Article | Physical Review Applied 8, 024012  (2017)
J. Goetz, S. Pogorzalek, F. Deppe, K. G. Fedorov, P. Eder, M. Fischer, F. Wulschner, E. Xie, A. Marx, R. Gross
Research Article | Physical Review Letters 118, 103602  (2017)
J. Goetz, F. Deppe, P. Eder, M. Fischer, M. Müting, J. P. Martínez, S. Pogorzalek, F. Wulschner, E. Xie, K. G. Fedorov, A. Marx, R. Gross
Research Article | Quantum Sci. Technol. 2, 025002  (2017)
Kirill G. Fedorov, L. Zhong, S. Pogorzalek, P. Eder, M. Fischer, J. Goetz, E. Xie, F. Wulschner, K. Inomata, T. Yamamoto, Y. Nakamura, R. Di Candia, U. Las Heras, M. Sanz, E. Solano, E. P. Menzel, F. Deppe, A. Marx, R. Gross
Research Article | Physical Review Letters 117, 020502  (2016)
J. Goetz, F. Deppe, M. Haeberlein, F. Wulschner, C. W. Zollitsch, S. Meier, M. Fischer, P. Eder, E. Xie, K. G. Fedorov, E. P. Menzel, A. Marx, and R. Gross
Research Article | Journal of Applied Physics 119, 015304  (2016)
F. Wulschner, J. Goetz, F. R. Koessel, E. Hoffmann, A. Baust, P. Eder, M. Fischer, M. Haeberlein, M. J. Schwarz, M. Pernpeintner, E. Xie, L. Zhong, C. W. Zollitsch, B. Peropadre, J.-J. Garcia Ripoll, E. Solano, K. Fedorov, E. P. Menzel, F. Deppe, A. Marx, R. Gross
Research Article | EPJ Quantum Technology 3, 10  (2016)
A. Baust, E. Hoffmann, M. Haeberlein, M. J. Schwarz, P. Eder, J. Goetz, F. Wulschner, E. Xie, L. Zhong, F. Quijandria, D. Zueco, J.-J. Garcia Ripoll, L. Garcia-Alvarez, G. Romero, E. Solano, K. G. Fedorov, E. P. Menzel, F. Deppe, A. Marx, R. Gross
Research Article | Physical Review B 93, 214501  (2016)
Max Haeberlein, Frank Deppe, Andreas Kurcz, Jan Goetz, Alexander Baust, Peter Eder, Kirill Fedorov, Michael Fischer, Edwin P. Menzel, Manuel J. Schwarz, Friedrich Wulschner, Edwar Xie, Ling Zhong, Enrique Solano, Achim Marx, Juan-José García-Ripoll, Rudolf Gross
Research Article | arXiv:1506.09114
R. Di Candia, K. G. Fedorov, L. Zhong, S. Felicetti, E. P. Menzel, M. Sanz, F. Deppe, A. Marx, R. Gross, E. Solano
Research Article | EPJ Quantum Technology 2, 25  (2015)
Contact
Coordinator

Thomas Schulte-Herbrüggen (TUM)

Funded by
Free State of Bavaria
Funding program
Elite Network of Bavaria
From Electronic Correlations to Functionality (TRR80)
Funded by German Research Foundation (DFG)
The collaborative research center TRR 80 connects fundamental research on emergent new materials properties driven by strong electronic correlations with the focussed exploration for possible new functionalities in technological devices. At the heart of the materials properties of interest are the strong interplay of charge, spin, orbital, and lattice degrees of freedom, leading to a multitude of complex new phases on different length and time-scales with fascinating electronic properties as well as novel generic excitations. Systematic determination of large susceptibilities to applied fields, perturbations and defects yield complex phase diagrams, which represent a major avenue towards tailored functionalities that may be exploited in designed composite-systems. Research in TRR 80 focusses in particular on novel phenomena in d- and f-electron materials.

Since the start of the Transregio in 2010 the successful development of experimental and theoretical tools to tackle correlated electron systems provided a basis for shaping and advancing this mission in the second and upcoming third funding period. These activities are organized in terms of three research areas comprising the synthesis and characterization of correlated quantum matter with non-trivial topological properties (research area E), the investigation of their emergent excitations utilizing a variety of dynamical methods (research area F) and utilization of reduced dimensions and interfaces for functionalization (research area G). Within the third funding period of the Transregio, the most interesting and promising avenues to realize and implement novel functionalities will be addressed by combined experimental and theoretical efforts across the different research areas E, F, and G. These arise, in particular, from the interplay of electronic correlations and non-trivial topological winding in real and reciprocal space, driven by large spin-orbit coupling, and from electronic reconstructions in thin films, heterostructures, surfaces and interfaces.

The research program presented in the following exploits the very broad spectrum of experimental and theoretical techniques available at the participating institutions. In addition to the University of Augsburg and the Technische Universität München, with its high-intensity neutron source Heinz Maier-Leibnitz, research groups from the University of Duisburg-Essen, the Walther Meissner Institute for Low Temperature Research of the Bavarian Academy of Sciences (München), the Max Planck Institute for Solid State Research (Stuttgart), and the École Polytechnique Fédérale de Lausanne will jointly tackle a broad range of challenges in the description and manipulation of correlated electron materials.

As a unique feature, the consortium includes an unusually broad range of advanced methods to achieve its goals. High-quality single crystalline bulk as well as thin film and heterostructure samples across different material classes will be synthesized and characterized. The materials prepared will be investigated by a large variety of diffractive and spectroscopic methods, and the results modeled in terms of material-specific density-functional theory as combined with powerful techniques based on dynamical mean-field theory. The expertise of the principal investigators involved includes the theoretical treatment of many-body localization and spectroscopic studies of the impact of disorder on correlated electronic structures - representing one of the most outstanding problems of 21st century physics. Taken together, the symbiosis of all the available methods and techniques for gaining a deep understanding of the fundamental properties of bulk materials and highly sophisticated, tailored heterostructures will allow harvesting novel functionalities that originate in strong electronic correlations.

Publications
N. Lazarević, A. Baum, A. Milosavljević, L. Peis , R. Stumberger, J. Bekaert , A. Šolajić, J. Pešić Aifeng Wang, M. Šćepanović, A. M. Milinda Abeykoon, M. V. Milošević, C. Petrovic, Z. V. Popović, R. Hackl
Research Article | Physical Review B 106, 094510  (2022)
Aifeng Wang, Ana Milosavljevic, A. M. Milinda Abeykoon, Valentin Ivanovski, Qianheng Du, Andreas Baum, Eli Stavitski, Yu Liu, Nenad Lazarevic, Klaus Attenkofer, Rudi Hackl, Zoran Popovic, and Cedomir Petrovic
Research Article | Inorganic Chemistry 61, 11036  (2022)
Daniel Jost, Leander Peis, Ge He, Andreas Baum, Stephan Geprägs, Johanna C. Palmstrom, Matthias S. Ikeda, Ian R. Fisher, Thomas Wolf, Samuel Lederer, Rudi Hackl
Research Article | Comms. Phys. 5, 201  (2022)
Preprint: arXiv:2111.07521
Tianyi Liu, Daniel Jost, Brian Moritz, Edwin W. Huang, Rudi Hackl, Thomas P. Devereaux
Research Article | arXiv:2101.07486
M. Puviani, A. Baum, S. Ono, Y. Ando, R. Hackl, D. Manske
Research Article | Physical Review Letters 127, 197001  (2021)
Preprint: arXiv:2012.01922
Ramona Stumberger
Master Thesis | Technische Universität München  (2021)
Ge He, Leander Peis, Ramona Stumberger, Lilian Prodan, Vladimir Tsurkan, Nico Unglert, Liviu Chioncel, István Kézsmárki, Rudi Hackl
Research Article | Phys. Status Solidi B , 2100169  (2021)
S. Djurdjić Mijin, A. Baum, J. Bekaert, A. Solajić,1 J. Pešić, Y. Liu, Ge He, M. V. Milošević, C. Petrovic, Z. V. Popović, R. Hackl, and N. Lazarević
Research Article | Physical Review B 103, 245133  (2021)
Minghao Zhang
Master Thesis | Technische Universität München  (2021)
Lukas Liensberger, Franz X. Haslbeck, Andreas Bauer, Helmuth Berger, Rudolf Gross, Hans Huebl, Christian Pfleiderer, Mathias Weiler
Research Article | Physical Review B 104, L100415  (2021)
Preprint: arXiv:2102.11713
N. Lazarević and R. Hackl
Review | Journal of Physics: Condensed Matter 32, 413001  (2020)
S. Lederer, D. Jost, R. Hackl, E. Berg, S.A. Kivelson
Research Article | Philosophical Magazine, Part B: Condensed Matter Physics 100, 2477  (2020)
Harrison Ruiz, Yao Wang, Brian Moritz, Andreas Baum, Rudi Hackl, and Thomas P. Devereaux
Research Article | Physical Review B 99, 125130  (2019)
A. Baum, H. N. Ruiz, N. Lazarevic, Yao Wang, T. Böhm, R. Hosseinian Ahangharnejhad, P. Adelmann, T. Wolf, Z. V. Popovic, B. Moritz, T. P. Devereaux, and R. Hackl
Research Article | Communications Physics 2, 14  (2019)
Bernhard Muschler
PHD Thesis | Technische Universität München  (2012)
Contact
Coordinator

Philipp Gegenwart (U Augsburg)

Grant No.
TRR80
Funded by
German Research Foundation (DFG)
Funding program
Collaborative Research Centre (SFB/TRR)
Multi-qubit Gates for the Efficient Exploration of Hilbert Space with Superconducting Qubit Systems
Funded by German Research Foundation (DFG)
The goal of this research project is to explore the potential of multi-qubit gates for quantum computing. The main focus is on speeding up quantum algorithms based on the variational quantum eigensolver (VQE) method on a superconducting qubit platform.

This quantum algorithm determines the groundstate of a given Hamiltonian, for example a molecular electronic configuration Hamiltonian. The quantum state of the system is steered to the target state by varying parameters of a gate sequence on the qubits to optimize a cost function on a classical computer. The advantage of such a hybrid quantum-classical computation over a purely classical one is that high-dimensional multi-qubit states can be stored efficiently on the quantum device, which is not possible on a classical memory because of the exponentially large number of state coefficients. The challenge on today’s quantum computers is, however, that the VQE algorithm has to converge to the target state before decoherence sets in. It's circuit-depth must be short. The main aim of this project is, therefore, to explore the efficient generation of multi-qubit states going beyond the current paradigm of decomposing all state manipulations into single and two-qubit gates. We will investigate multi-qubit operations that will allow us to entangle multiple qubits at the same time. This will result in short-depth efficient algorithms provided that the fidelity of the multi-qubit gate can be kept high. We use fixed-frequency transmon qubits and two-qubit gates based on parametrically driven tunable couplers. We address the question if there is an advantage in using multi-qubit gates over traditional two-qubit gates not only in theory but also in practical experiments. While theoretically the answer is likely to be affirmative, on the experimental side it is not clear what gate fidelities can be reached and how these compare to a decomposition of multi-qubit gates into two-qubit interactions. We explore N-way tunable couplers that are either capacitively and galvanically coupled to N qubits and evaluate the maximum number of qubits. We investigate multi-qubit entangling interactions via parametric frequency-modulation of the coupler. Different methods are compared, such as resonant or dispersive interactions based on simultaneous pulses to generate different classes of entangled states. The final goal is a four-qubit experiment targeting a quantum chemistry problem, such as determining the ground state and energy spectrum of molecular hydrogen (H2), and to assess the efficiency of multi-qubit gates. It is straightforward to then extend the methods that are tested in this project with a few qubits to larger systems to bring practical applications closer within reach by adding building blocks with higher connectivity and multi-qubit gate capabilities.

Publications
Maximilian Nägele, Christian Schweizer, Federico Roy, Stefan Filipp
Research Article | Physical Review Research 4, 033166  (2022)
Preprint: arXiv:2203.07331
Optimal Control of Entangling Gates in Superconducting Tunable-Coupler Architectures
Niklas Glaser
Master Thesis | Technische Universität München  (2021)
Contact
Grant No.
FI 2549/1-1
Funded by
German Research Foundation (DFG)
Funding program
Individual Research Grant
Evolution of the charge carrier properties and electronic correlations in layered organic metals near the Mott metal-insulator transition
Funded by German Research Foundation (DFG)
The Mott transition is one of the most fundamental correlation-driven instabilities in normal metals. Despite extensive studies, there are important unresolved problems and open questions, in particular regarding the experimental study of the metallic ground state in the immediate vicinity of the insulating state in well-defined model systems.

Within this project, we join experts from experimental and theoretical physics and materials science to tackle these problems. We will employ kappa-type organic charge transfer salts as quasi-2D electronic model systems with bandwidth-controlled Mott instability for tracking the evolution of key characteristics of the charge carriers in the metal/insulator coexistence region of the phase diagram as well as in the neighboring homogeneous metallic state. In particular, we will study (i) the correlation-induced renormalization of the effective mass, (ii) the exact geometry and topology of the Fermi surface, and (iii) the coherence of charge transport. The systematic study of these characteristics in well-defined model systems will provide a crucial test for the existing theories of the Mott metal-insulator transition.A key objective of the project is the disentanglement of contributions of charge, spin, and lattice degrees of freedom to the metal-insulator instability. This problem will be addressed by studying kappa-type salts with different strength of geometrical frustration, magnetic interactions, and lattice disorder. The salts of BEDT-TTF with different anions are particularly suited for studying the effects of geometrical frustration, while BETS salts with localized magnetic moments give access to the interplay between electronic correlations and magnetic interactions. The coupling of the electronic state to lattice degrees of freedom will be probed by studying the influence of deuteration of BEDT-TTF salts on the charge carrier properties and by tracing the impact of ethylene-group disorder in these salts.The main experimental probes for addressing the above issues will be magnetic quantum oscillations, semiclassical anisotropic magnetotransport, and resistivity anisotropy. A precise control of the electronic ground state with respect to the metal-insulator boundary will be realized by fine-tuning materials with quasi-hydrostatic pressure as well as "chemical pressure". A quantitative analysis of the experimental results will be carried out by the theory team involved in the project using the state-of-the-art theory of high-field magnetotransport in quasi-2D metals as well as of the charge transport in phase-separated electronic media. Further development of the (magneto)transport theory in the segments related to the proposed experiments is planned.The availability of top-quality single crystals of kappa-type salts is crucial for the success of the planned project. The preparation and characterization of such crystals will be carried out by the experienced materials science team of the project.

Publications
Sebastian Oberbauer, Shamil Erkenov, Werner Biberacher, Natalia D. Kushch, Rudolf Gross, Mark V. Kartsovnik
Research Article | Physical Review B 107, 075139  (2023)
Preprint: arXiv:2208.03230
R. Ramazashvili, P. D. Grigoriev, T. Helm, F. Kollmannsberger, M. Kunz, W. Biberacher, E. Kampert, H. Fujiwara, A. Erb, J. Wosnitza, R. Gross & M. V. Kartsovnik
Research Article | npj Quantum Materials 6, 11  (2021)
Kira Riedl, Elena Gati, David Zielke, Steffi Hartmann, Oleg M. Vyaselev, Nataliya D. Kushch, Harald O. Jeschke, Michael Lang, Roser Valentí, Mark V. Kartsovnik, Stephen M. Winter
Research Article | Physical Review Letters 127, 147204  (2021)
Preprint: arXiv:2106.02130
V.N. Zverev, W. Biberacher, S. Oberbauer, I. Sheikin, P. Alemany, E. Canadell, M.V. Kartsovnik
Research Article | Physical Review B 99, 125136  (2019)
Team
Grant No.
KA 1652/5-1, GR 1132/19-1
Funded by
German Research Foundation (DFG)
Funding program
Individual Research Grant
Towards pure spin currents in epitaxial all oxide heterostructures
Funded by German Research Foundation (DFG)
Over the last years, the generation and detection of pure spin currents, i.e. the flow of angular momentum without any accompanying charge current, has been successfully realized. This opened fascinating opportunities for fundamental physics experiments and novel applications in spin electronics. However, a profound understanding of the phenomena associated with pure spin currents and the materials systems suitable for their study is still missing.

The main objective of this research proposal is the systematic study of pure spin current physics in all oxide heterostructures, which are promising for this purpose but hardly investigated so far. On the one hand, the planned experiments are expected to provide a profound understanding of the rich variety of phenomena associated with spin-orbit interaction in oxide materials and its dependence on the specific material parameters. On the other hand, the project aims to develop and investigate novel materials with large spin Hall angle, i.e. with a large efficiency for electrical generation and detection of pure spin currents. Moreover, it aims at the tunability of spin-orbit coupling in oxides via strain, oxygen vacancies, and temperature. The boost of the efficiency for spin current generation and detection is a prerequisite for the application of pure spin currents in efficient spintronic devices. The ambitious project objectives will be met by fabricating high-quality oxide heterostructures by laser-molecular beam epitaxy and by systematically studying pure spin current generation and detection in experiments based on longitudinal spin Seebeck effect and spin Hall magnetoresistance. The applicants contribute broad expertise in both thin film technology and the experimental characterization techniques for spin current phenomena to the successful implementation of the ambitious research program.

Publications
Monika Scheufele, Janine Gückelhorn, Matthias Opel, Akashdeep Kamra, Hans Huebl, Rudolf Gross, Stephan Geprägs, Matthias Althammer
Research Article | APL Materials 11, 091115  (2023)
Preprint: arXiv:2306.00375
Janine Gückelhorn, Sebastián de-la-Peña, Matthias Grammer, Monika Scheufele, Matthias Opel, Stephan Geprägs, Juan Carlos Cuevas, Rudolf Gross, Hans Huebl, Akashdeep Kamra, Matthias Althammer
Research Article | Physical Review Letters 130, 216703  (2023)
Preprint: arXiv:2209.09040
Matthias Grammer
Master Thesis | Technische Universität München  (2022)
Janine Gückelhorn, Akashdeep Kamra, Tobias Wimmer, Matthias Opel, Stephan Geprägs, Rudolf Gross, Hans Huebl, Matthias Althammer
Research Article | Physical Review B 105, 094440  (2022)
Preprint: arXiv:2112.03820
Manuel Müller, Monika Scheufele, Janine Gückelhorn, Luis Flacke, Mathias Weiler, Hans Huebl, Stephan Geprägs, Rudolf Gross, Matthias Althammer
Research Article | Journal of Applied Physics 132, 233905  (2022)
Preprint: arXiv:2204.11498
Matthias Althammer
Review | Physica Status Solidi (RRL) 15, 2100130  (2021)
Preprint: arXiv:2103.08996
Elisabeth Meidinger
Master Thesis | Technische Universität München  (2021)
Tobias Wimmer
PHD Thesis | Technical University of Munich  (2021)
Emir Karadza
Master Thesis | Technische Universität München  (2021)
Tobias Wimmer, Janine Gückelhorn, Sebastian Wimmer, Sergiy Mankovsky, Hubert Ebert, Matthias Opel, Stephan Geprägs, Rudolf Gross, Hans Huebl, Matthias Althammer
Research Article | Physical Review B 104, L140404  (2021)
Preprint: arXiv:2103.12697
Misbah Yaqoob
Master Thesis | Technische Universität München  (2021)
Janine Gückelhorn, Tobias Wimmer, Manuel Müller, Stephan Geprägs, Hans Huebl, Rudolf Gross, Matthias Althammer
Research Article | Physical Review B 104, L180410  (2021)
Preprint: arXiv:2108.03263
Paul Rosenberger, Matthias Opel, Stephan Geprägs, Hans Huebl, Rudolf Gross, Martina Müller, Matthias Althammer
Research Article | Applied Physics Letters 118, 192401  (2021)
Preprint: arXiv:2103.02706
Korbinian Rubenbauer
Master Thesis | Technische Universität München  (2021)
Monika Scheufele
Master Thesis | Technische Universität München  (2021)
Philipp Schwenke
Master Thesis | Technische Universität München  (2021)
J. Gückelhorn, T. Wimmer, S. Geprägs, H. Huebl, R. Gross, and M. Althammer
Research Article | Applied Physics Letters 117, 182401  (2020)
Grant No.
AL 2110/2-1
Funded by
German Research Foundation (DFG)
Funding program
Individual Research Grant
Spin dynamics of hybrid skyrmion-magnon solitons
Funded by German Research Foundation (DFG)
The transport and manipulation of magnetic texture offers a promising pathway for future information storage and transfer with enhanced functionality. Nanoscale, topologically protected magnetic whirls called skyrmions are particularly intriguing for this purpose.
The realization of skyrmionic devices relies on understanding and manipulating skyrmion dynamics. Broadband magnetic resonance is an established tool for spectroscopy of magnetically ordered thin films. This technique has already shown its potential for the investigation of skyrmion and helimagnon dynamics in isolated chiral magnets. Ferromagnetic multilayers form the basis of today’s spintronic devices and multilayers of chiral magnets and ferromagnets may be similarly important in future skyrmionic devices. However, such hybrid multilayers have rarely been experimentally studied so far. In this project, we will exploit static and dynamic coupling of spin texture and dynamics in these chiral magnetic thin film heterostructures to generate novel topological ground states, interactions and excitations. In particular, static coupling can be mediated by exchange interactions, while dynamic coupling will also arise due to spin current flow across the chiral magnet/ferromagnet interface. We will use broadband magnetic resonance spectroscopy to quantify spin dynamics at the crossing of ferromagnet and chiral magnet dispersions. In this way, we will investigate the potential of exciting dynamics of novel hybrid skyrmion-magnon modes. Furthermore, at the ferromagnet/chiral magnet interface, exotic topological structures such as skyrmion cones are predicted to emerge. These topological solitons are fundamentally interesting and might have great application potential and intriguing dynamic properties, which we will explore. A novel two-tone microwave spectroscopy method will be employed for the study of nonlinear interactions between skyrmion and magnon excitations in these multilayers. These nonlinear interactions might be useful to control, e.g. magnetic damping of skyrmion excitations.Finally, we will use travelling spin wave spectroscopy to study magnon propagation in the presence of an adjacent skyrmion lattice, which can serve as a natural nanoscale magnonic grating coupler and magnonic crystal. These experiments unite the disciplines of magnonics and skyrmionics.
Publications
Manuel Müller, Monika Scheufele, Janine Gückelhorn, Luis Flacke, Mathias Weiler, Hans Huebl, Stephan Geprägs, Rudolf Gross, Matthias Althammer
Research Article | Journal of Applied Physics 132, 233905  (2022)
Preprint: arXiv:2204.11498
Misbah Yaqoob
Master Thesis | Technische Universität München  (2021)
Liensberger, Lukas
PHD Thesis | Technische Universität München  (2021)
Luis Flacke, Valentin Ahrens, Simon Mendisch, Lukas Körber, Tobias Böttcher, Elisabeth Meidinger, Misbah Yaqoob, Manuel Müller, Lukas Liensberger, Attila Kákay, Markus Becherer, Philipp Pirro, Matthias Althammer, Stephan Geprägs, Hans Huebl, Rudolf Gross, Mathias Weiler
Research Article | Physical Review B 104, L100417  (2021)
Preprint: arXiv:2102.11117
Korbinian Rubenbauer
Master Thesis | Technische Universität München  (2021)
Tobias Hula, Katrin Schultheiss, Aleksandr Buzdakov, Lukas Körber, Mauricio Bejarano, Luis Flacke, Lukas Liensberger, Mathias Weiler, Justin M. Shaw, Hans T. Nembach, Jürgen Fassbender, and Helmut Schultheiss
Research Article | Applied Physics Letters 117, 042404  (2020)
Luis Flacke, Lukas Liensberger, Matthias Althammer, Hans Huebl, Stephan Geprägs, Katrin Schultheiss, Aleksandr Buzdakov, Tobias Hula, Helmut Schultheiss, Eric R. J. Edwards, Hans T. Nembach, Justin M. Shaw, Rudolf Gross, Mathias Weiler
Research Article | Applied Physics Letters 115, 122402  (2019)
Lukas Liensberger, Luis Flacke, David Rogerson, Matthias Althammer, Rudolf Gross, Mathias Weiler
Research Article | IEEE Magnetics Letters 10, 5503905  (2019)
Coordinator

Christian Pfleiderer (TUM)

Grant No.
SPP 2137
Funded by
German Research Foundation (DFG)
Funding program
Priority Programme (SPP)