Superconducting Quantum Circuits

In superconducting circuits, the superconducting condensate can be described by a quantum mechanical wave function with a single amplitude and phase. As a consequence, superconducting circuits can be engineered in a way to behave as macroscopic artificial atoms or quantum harmonic oscillators. For this reasons, they are called superconducting quantum circuits.
Team
Frank Deppe, Kirill Fedorov, Stefan Filipp, Rudolf Gross, Nadezhda Kukharchyk, Achim Marx, Anirban Bhattacharjee, Julius Feigl, Lasse Södergren, Ivan Tsitsilin, Christian Schneider, Vera Bader, Martin Knudsen, Hans Huebl, Saya Schöbe, Klaus Liegener, Christian Gnandt
ICON project
Recent projects
Munich Center for Quantum Science and Technology
Rudolf Gross, Stefan Filipp, Hans Huebl, Matthias Althammer, Kirill Fedorov, Florian Fesquet, Kedar Honasoge, Achim Marx, Nadezhda Kukharchyk, Stephan Geprägs, Thomas Luschmann, Ana Strinic
Munich Quantum Valley
Rudolf Gross, Stefan Filipp
Munich Quantum Valley Quantencomputer Demonstratoren – Supraleitende Qubits
Stefan Filipp, Daniil Bazulin, Niklas Bruckmoser, Stefan Filipp, Niklas Glaser, Franz X. Haslbeck, Gerhard Huber, Martin Knudsen, Leon Koch, Klaus Liegener, Achim Marx, Hans Huebl, Rudolf Gross, Lea Richard, Joao Henrique Romeiro Alves, Federico Roy, Johannes Schirk, Christian Schneider, Christian Schweizer, Malay Singh, Ivan Tsitsilin, Florian Wallner, Florian Wallner, Max Werninghaus
ICON publication
Recent publications
Cryogenic microwave link for quantum local area networks
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 | npj Quantum Information 11, 87  (2025)
Preprint: arXiv:2308.12398
Fabrication of low-loss Josephson parametric devices
K. E. Honasoge, M. Handschuh, W. K. Yam, S. Gandorfer, D. Bazulin, N. Bruckmoser, L. Koch, A. Marx, R. Gross, K. G. Fedorov
Research Article | Physical Review B 111, 214508  (2025)
Preprint: arXiv:2412.11280
Two-dimensional Planck Spectroscopy for Microwave Photon Calibration
S. Gandorfer, M. Renger, W. K. Yam, F. Fesquet, A. Marx, R. Gross, K. G. Fedorov
Research Article | Physical Review Applied 23, 024064  (2025)
Preprint: arXiv:2308.02389
A Journey into Quantum Illumination
Fabian Kronowetter
PHD Thesis | Technical University of Munich  (2024)
Imperfect photon detection in quantum illumination
F. Kronowetter, M. Würth, W. Utschick, R. Gross, K. G. Fedorov
Research Article | Physical Review Applied 21, 014007  (2024)
Preprint: arXiv:2308.02343

We study the foundations and applications of superconducting quantum circuits. The latter include the astonishing demonstration of textbook quantum mechanics as well as quantum information processing (QIP) and quantum simulation. Our research does not only address the foundations of quantum information systems and superconducting quantum technology, but also key fundamental questions regarding quantum coherence, quantum dynamics, and decoherence mechanisms in solid state quantum systems. Furthermore, it requires extremely sensitive measurements at millikelvin temperatures.