Courses
Within the seminar, students give talks on current topics in condensed matter physics. The seminar aims to give a closer look at new developments in condensed matter physics and to show how these developments can be transferred into applications. The seminar focuses on spin electronics, spin dynamics, solidstate quantum information processing, the physics of solidstate nanostructures, and high temperature superconductivity. These topics are in the focus of several research projects of WMI and collaborative research programs in the Munich area (e.g. the Excellence Cluster "Munich Center for Quantum Science and Technology (MCQST)", the Munich Quantum Valley e.V., as well as several BMBF and EU projects).
The seminar is relevant for the special courses on Quantum Science and Technology, Superconductivity and Low Temperature Physics as well as on Magnetism and Spintronics. It is suitable for bachelor students in the 5th semester or higher and for master students.
Schedule
17.10.2023  Preliminary discussion and assignment of topics (R. Gross, N.N.) 
24.10.2023  Preliminary discussion and assignment of topics (R. Gross, N.N.) 
28.11.2023  Otto Graf (Technical University of Munich) Loopholefree Bell inequality violation with superconducting circuits (S. Storz et al., Nature 617, 265270 (2023)) (Advisor: Rudolf Gross) 
19.12.2023  Alexander Dolpp (Technical University of Munich) Singleelectron spin resonance detection by microwave photon counting (Z. Wang et al., Nature 619, 276–281 (2023)) (Advisor: Nadezhda Kukharchyk) 
List of open topics for seminar talks in WS 2023/2024:

Roomtemperature quantum optomechanics using an ultralow noise cavity (G. Huang et al., Nature 626 512517 (2024))

Quantum spin nematic phase in a squarelattice iridate (Hoon Kim et al., Nature 625 264269 (2024))

Evidence for chiral supercurrent in quantum Hall Josephson junctions (H. Vignaud et al., Nature 624 545550 (2023))

Spinon Heat Transport in the ThreeDimensional Quantum Magnet PbCuTe2O6 (Xiaochen Hong et al., Phys. Rev. Lett. 131, 256701 (2023))

Exploring largescale entanglement in quantum simulation (M.K. Joshi et al., Nature 624 539544 (2023))

A quantum electromechanical interface for longlived phonons (A. Bozkurt et al., Nature Physics 19 13261332 (2023))

Quantum advantage in microwave quantum radar (R. Assouly et al., Nature Physics 19, 14181422 (2023))

Microwave Fluorescence Detection of Spin Echoes (E. Billaud et al., Phys. Rev. Lett. 131, 100804 (2023))

Chiral phonons in quartz probed by Xrays (H. Ueda et al., Nature 618, 946950 (2023))

Fluctuationenhanced phonon magnetic moments in a polar antiferromagnet (F. Wu et al., Nature Physics (2023))

Timedomain observation of ballistic orbitalangularmomentum currents with giant relaxation length in tungsten (T.S. Seifert et al., Nature Nanotechnology (2023))

Observation of SpinWave Moiré Edge and Cavity Modes in Twisted Magnetic Lattices (Hanchen Wang et al., Phys. Rev. X 13, 021016 (2023))

Proximity superconductivity in atombyatom crafted quantum dots (L. Schneider et al., Nature 621, 6065 (2023))

Indistinguishable telecom band photons from a single Er ion in the solid state (S. Ourari et al., Nature 620, 977981 (2023))

no longer available: Singleelectron spin resonance detection by microwave photon counting (Z. Wang et al., Nature 619, 276–281 (2023))

Roomtemperature magnetoresistance in an allantiferromagnetic tunnel junction (Peixin Qin et al., Nature 613, 485 (2023))

Quantum oscillations of the quasiparticle lifetime in a metal (N. Huber et al., Nature 621, 276 (2023))

Observation of the orbital Hall effect in a light metal Ti (YoungGwan Choi et al., Nature 619, 52–56 (2023))

Millisecond Coherence in a Superconducting Qubit (Aaron Somoroff et al., Phys. Rev. Lett. 130, 267001 (2023))

no longer available: Loopholefree Bell inequality violation with superconducting circuits (S. Storz et al., Nature 617, 265270 (2023))

Beating the breakeven point with a discretevariableencoded logical qubit (Zhongchu Ni et al., Nature 616, 5660 (2023))

Macroscopic Quantum Test with Bulk Acoustic Wave Resonators (Björn Schrinski et al., Phys. Rev. Lett. 130, 133604 (2023))

Ondemand directional microwave photon emission using waveguide quantum electrodynamics (Bharath Kannan et al., Nature Physics 19, 394 (2023))

Nonlinear multifrequency phonon lasers with active levitated optomechanics (Tengfang Kuang et al., Nature Physics 19, 414 (2023))

Giant spin polarization and a pair of antiparallel spins in a chiral superconductor (R. Nakajima et al., Nature 613, 479 (2023))
W 2023
Within the Colloquium on Solid State Physics international experts present talks on recent important developments in the fields of solid state physics and solidstatebased quantum systems.
For the announcement of talks, see: https://www.wmi.badw.de/teaching/colloquiumonsolidstatephysics
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Content
Within the seminar Superconducting Quantum Circuits, students present stateoftheart developments in modern quantum technology with superconducting quantum circuits. In this field, funamental research in academia has meanwhile triggered highly dynamical activities from established large corporations (Google, IBM, Intel etc.) and ambitious startups (Rigetti, IQM, HQS etc.). In particular, superconducting quantum circuits belong to the few prime candidates for a scalable quantum computer.
Time/Place
12:00  14:00h, WMISeminarroom, room 143
Schedule
17.10.2023  Preliminary discussion and assignment of topics (M. Werninghaus et al.) 
24.10.2023  Preliminary discussion and assignment of topics (M. Werninghaus et al.) 
28.11.2023  Building Blocks of a FlipChip Integrated Superconducting Quantum Processor (Agatha Skoczylas) 
12.12.2023  Mechanically Induced Correlated Errors on Superconducting Qubits with Relaxation Times Exceeding 0.4 Milliseconds (Apollon Marangos) 
09.01.2024  Realtime quantum error correction beyond breakeven (Ludwig Martlmueller) 
16.01.2024  CANCELLED: Dissipative stabilization of dark quantum dimers via squeezed vacuum (Juan Soriano) 
23.01.2024  Control and readout of a superconducting qubit using a photonic link (Darius Haitsch) 
List of open topics for seminar talks in WS 2023/2024:
 Highfidelity parallel entangling gates on a neutralatom quantum computer (Simon J. Evered et al., Nature 622, 268272 (2023))
 Control and readout of a superconducting qubit using a photonic link (F. Lecocq, F. Quinlan, K. Cicak, J. Aumentado, S. A. Diddams & J. D. Teufel, Nature 591, 575579 (2021))
 Quantumenabled operation of a microwaveoptical interface (Rishabh Sahu, William Hease, Alfredo Rueda, Georg Arnold, Liu Qiu & Johannes M. Fink, Nature Communications 13, 1276 (2022))
 Autonomous error correction of a single logical qubit using two transmons (Ziqian Li, Tanay Roy, David Rodriguez Perez, KanHeng Lee, Eliot Kapit and David I. Schuster, arXiv:2302.06707v1 [quantph] (2023))
 A dissipatively stabilized Mott insulator of photons (Ruichao Ma, Brendan Saxberg, Clai Owens, Nelson Leung, Yao Lu, Jonathan Simon & David I. Schuster, Nature 566, 51–57 (2019))
 Realtime quantum error correction beyond breakeven (V. V. Sivak, A. Eickbusch, B. Royer, S. Singh, I. Tsioutsios, S. Ganjam, A. Miano, B. L. Brock, A. Z. Ding, L. Frunzio, S. M. Girvin, R. J. Schoelkopf & M. H. Devoret, Nature 616, 50–55 (2023))
 Threewave mixing travelingwave parametric amplifier with periodic variation of the circuit parameters (Anita Fadavi Roudsari, Daryoush Shiri, Hampus Renberg Nilsson, Giovanna Tancredi, Amr Osman, IdaMaria Svensson, Marina Kudra, Marcus Rommel, Jonas Bylander, Vitaly Shumeiko, Per Delsing, Appl. Phys. Lett. 122, 052601 (2023))
 Mechanically Induced Correlated Errors on Superconducting Qubits with Relaxation Times Exceeding 0.4 Milliseconds (Shingo Kono, Jiahe Pan, Mahdi Chegnizadeh, Xuxin Wang, Amir Youssefi, Marco Scigliuzzo, Tobias J. Kippenberg, arXiv:2305.02591 [quantph] (2023))
 Efficient LongRange Entanglement using Dynamic Circuits (Elisa Bäumer, Vinay Tripathi, Derek S. Wang, Patrick Rall, Edward H. Chen, Swarnadeep Majumder, Alireza Seif, Zlatko K. Minev, arXiv:2308.13065 [quantph] (2023))
 Tunable inductive coupler for high fidelity gates between fluxonium qubits (Helin Zhang, Chunyang Ding, D. K. Weiss, Ziwen Huang, Yuwei Ma, Charles Guinn, Sara Sussman, Sai Pavan Chitta, Danyang Chen, Andrew A. Houck, Jens Koch, David I. Schuster, arXiv:2309.05720 [quantph] (2023))
Topical directions of the seminar:
 Foundations and applications of superconducting quantum circuits in quantum computing, quantum simulation, quantum communication, quantum sensing, and quantum metrology.
 Superconducting quantum technology: Resonators, waveguides, quantum bits, couplers, quantumlimited amplifiers, quantum processors, quantum error correction etc.
 Stateoftheart fabrication and measurement tachniques for superconducting quantum circuits.
 Investigation of the fundamental lightmatter interaction "on a chip" using superconducting quantum circuits.
 Quantum information theoretical concepts: Entanglement, quantum gates, quantum algorithms, quantum memories, quantum measurements etc.
 The coupling of nanomechanical systems and spin ensembles to superconducting circuits.
 Challenges: longer quantum coherence, higher gate fidelities, scalability to a large number of qubits etc.
 Latest developments on the strive towards quantum advantages over conventional technology
 Propagating quantum microwaves emitted by superconducting circuits: quantum ressources, quantum microwave communication, quantum radar
You will be supported in the preparation of your talks from the research groups on superconducting quantum circuits, propagating quantum microwaves, and nanomechanics at the WaltherMeißnerInstitute.
Learning Outcome:
After the successful completion of the module the students are able
 To prepare presentation slides on a scientific topic and to clearly present a topical research field within a scientific talk.
 To discuss on a stateoftheart research field in a scientific way.
 To analyze and assess the latest development in quantum scinece and technology with superconducting circuits.
 To understand and explain the foundations of superconducting quantum systems and technology.
 To understand the foundations and the state of the art in quantum computing, quantum simulation, quantum communication, quantum sensing, and quantum metrology with supercondcuting circuits
 To understand the foundations and the state of the art in nanomechnical systems and spin ensembles
Preconditions:
Basic knowledge of condensed matter physics, foundations of quantum mechanics
W 2023
The content of the lecture includes the following topics:
 Basics properties of superconductors and superconducting materials (different types of superconducting materials, superconductors in a magnetic field, typeI and typeII superconductors, thermodynamic properties)
 Phenomenological description of superconductivity (London theory, superconductivity as a macroscopic quantum phenomenon, GinzburgLandau theory)
 Fluxoid quantization, Josephson effects
 Overview of microscopic BCS theory
 Critical currents
 Applications of superconductivity
 Unconventional superconductors (e.g. cuprates, ironpnictides)
W 2023
Within the WaltherMeißnerSeminar national and international experts present talks on current research related to the research topics of the WaltherMeißnerInstitute such as quantum information systems, superconducting qubits and quantum circuits, magnetism & spintronics, quantum microwave communication and sensing or the fabrication technology for superconducting and magnetic devices.
For the announcement of talks, see: https://www.wmi.badw.de/teaching/walthermeissnerseminar
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