The seminar is organized via LV0622

Content

This is the joint module page of LV0622 "Supraleitende Quantenschaltkreise" and LV1569 "Cavity-, Circuit- und Waveguide-QED".

Information about scheduling, paper-allocations and all other relevant parts of the seminar will be disseminated via E-mail - please register to the course module on TUM online so I can include you in the mailing list. 

Within the seminars, students present state-of-the-art 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

The seminar will take place on Tuesdays 12:15 - 14:00h, WMI-Seminarroom 143

Schedule

Below, you will find a list of papers we picked for the seminar. Please have a look and let us know by e-mail by Friday, 23 October which paper you would like to present (first and second choice), together with your preferred talk dates.

You will be put in contact with a tutor, that will help you in preparing the slides for your presentation. Typically, you will have one or two sessions with your tutor.  

We will organize a schedule for the seminar talks, and I would ask you to keep the timeslot of the seminar free, and also join the presentations of your peers. Until the schedule is released, the seminar will not take place! After release, we will follow the schedule. 

Your seminar talk should be about 30 minutes long, with 10-15 minutes of scientific discussion afterwards. 

List of open topics for seminar talks in WS2026:
Please pick a topic related to your seminar - ie. theory for LV1569 and quantum computing, quantum sensing or hybrid systems for LV0622

1. Experimental focused Papers

Quantum Simulation:

• Observation of constructive interference at the edge of quantum ergodicity, Nature, 2025, https://doi.org/10.1038/s41586-025-09526-6

Fabrication and Materials:

• Krypton-sputtered tantalum films for scalable high-performance quantum devices, Nature Materials, 2026, https://doi.org/10.1038/s41563-026-02718-z

Alternative Qubits and Qubit Design:

• Scalable fluxonium architectures (main paper + comparison):
  • Scalable Fluxonium Quantum Processors via Tunable-Coupler Architecture, arXiv:2604.13363, 2026, https://arxiv.org/abs/2604.13363
  • High-Fidelity Entangled States in a Connectivity-Four Fluxonium Quantum Processor, arXiv:2608.25503, 2026, https://arxiv.org/abs/2608.25503

Readout and Measurement:

• Measurement-induced state transitions (main paper + supplementary):
  • Probing excited-state dynamics of transmon ionization, Physical Review X, 2026, https://doi.org/10.1103/8tdv-hgmb
  • Characterization of drive-induced unwanted state transitions in superconducting circuits, Physical Review X, 2026, https://doi.org/10.1103/zdpg-mhpc
• High-performance multiplexed readout of superconducting qubits with a tunable broadband Purcell filter, Physical Review Applied, 2026, https://doi.org/10.1103/ykvq-bkfk

Noise, Decoherence and Error Sources:

• Correlated Phase Error Bursts in a Gap-Engineered Superconducting Qubit Array, Physical Review X, 2026, https://doi.org/10.1103/1bl4-b2f7

Gates, Control and Calibration:

• A quantum computer controlled by superconducting digital electronics at millikelvin temperature, Nature Electronics, 2026, https://doi.org/10.1038/s41928-026-01576-6
• Above 99.9% Fidelity Single-Qubit Gates, Two-Qubit Gates, and Readout in a Single Superconducting Quantum Device, PRX Quantum, 2026, https://doi.org/10.1103/n86s-2b88

Error Correction and Quantum Architecture:

• Reinforcement learning control of quantum error correction, Nature, 2026, https://doi.org/10.1038/s41586-026-10759-2

Quantum Communication and Networking:

• Remote entanglement, two approaches (main paper + comparison):
  • Remote entanglement generation via enhanced quantum state transfer, PRX Quantum, 2026, https://doi.org/10.1103/4x8d-cmyx
  • Distributing stationary qubit entanglement through a nonlocal squeezed reservoir, Physical Review X, 2026, https://doi.org/10.1103/r4jt-j39w
• Teleportation and Entanglement Swapping of Continuous Quantum Variables of Microwave Radiation, Physical Review X, 2025, https://doi.org/10.1103/9cpm-kr4h
• A thermal-noise-resilient microwave quantum network up to 4 K, Nature Electronics, 2026, https://doi.org/10.1038/s41928-026-01581-9

Hybrid Quantum Systems:

• A mechanical qubit, Science, 2024, https://doi.org/10.1126/science.adr2464
• Measurement of a strong nonlinear force between superconductors compatible with the Casimir force, Nature Communications, 2026, https://doi.org/10.1038/s41467-026-75261-9

2. Theory focused Papers

Alternative Qubits and Qubit Design:

• Repetition Cat Qubits for Fault-Tolerant Quantum Computation, Physical Review X, 2019, https://doi.org/10.1103/PhysRevX.9.041053
• Hardware-efficient quantum error correction via concatenated bosonic qubits, Nature, 2025, https://doi.org/10.1038/s41586-025-08642-7

Readout and Measurement:

• Reminiscence of Classical Chaos in Driven Transmons, PRX Quantum, 2023, https://doi.org/10.1103/PRXQuantum.4.020312
• Transmon platform for quantum computing challenged by chaotic fluctuations, Nature Communications, 2022, https://doi.org/10.1038/s41467-022-29940-y
• Measurement-Induced Transmon Ionization, Physical Review X, 2024, https://doi.org/10.1103/PhysRevX.14.041023

Noise, Decoherence and Error Sources:

• A Polynomial-Time Classical Algorithm for Noisy Quantum Circuits, Physical Review X, 2025, https://doi.org/10.1103/xct1-7kf2
• Hamiltonian and Liouvillian learning in weakly-dissipative quantum many-body systems, Quantum Science and Technology, 2025, https://iopscience.iop.org/article/10.1088/2058-9565/ad9ed5

Error Correction and Quantum Architecture:

• High-threshold and low-overhead fault-tolerant quantum memory, Nature, 2024, https://doi.org/10.1038/s41586-024-07107-7
• Nearest-neighbour gates are all you need: High-rate quantum low-density parity-check codes on a planar grid, arXiv:2606.19482, 2026, https://arxiv.org/abs/2606.19482
• Magic state cultivation on a superconducting quantum processor, arXiv:2512.13908, 2025, https://arxiv.org/abs/2512.13908

Many-Body Quantum Optics:

• Bound State in the Continuum and Multiple Atom State Transfer Applications in a Waveguide QED Setup, Physical Review Letters, 2026, https://doi.org/10.1103/y1rg-p9hx
• Superbunching from coherently driven atoms in a waveguide, arXiv:2506.05147, 2025, https://arxiv.org/abs/2506.05147
• Collective decay of interacting bosons, arXiv:2606.06621, 2026, https://arxiv.org/abs/2606.06621

Entanglement Theory:

• Floquet Reservoir Engineering for Remote Logical Entanglement, arXiv:2607.21360, 2026, https://arxiv.org/abs/2607.21360
• Universal Time-Entanglement Trade-Off in Open Quantum Systems, PRX Quantum, 2024, https://doi.org/10.1103/PRXQuantum.5.040305

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, quantum-limited amplifiers, quantum processors, quantum error correction etc.
• State-of-the-art fabrication and measurement tachniques for superconducting quantum circuits.
• Investigation of the fundamental light-matter 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 Walther-Meißner-Institute.

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 state-of-the-art 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