Microwave response of an Andreev level

ORAL

Abstract

We measured the microwave response of an Andreev level formed in a semiconducting nanowire quantum dot connecting two superconducting leads using a circuit quantum electrodynamics probe. This probe gave us unprecedented access to the physics of Andreev levels by making it possible to separately measure the response of different many-body configurations of the system. Comparing these responses, we observed the violation of the particle-hole symmetry that points to an appreciable Coulomb interaction in the dot. We also found that the energy-phase relation of a state with a single electron at the dot had a strong π-shifted phase dependence, which can be attributed to contribution of the continuum states to the supercurrent. Our results are in a good agreement with a minimal theoretical model.

*Work supported by: ARO

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Publication: arXiv:2106.00028

Presenters

  • Pavel Kurilovich

    • Yale University

Authors

  • Pavel Kurilovich

    • Yale University

  • Valla Fatemi

    • Yale University

  • Vladislav Kurilovich

    • Yale University

  • Max Hays

    • Yale University
    • Department of Electrical Engineering & Computer Science and Department of Physics, Massachusetts Institute of Technology

  • Nicholas E Frattini

    • Yale University

  • Daniel Bouman

    • QuTech and Kavli Institute of Nanoscience, Delft University of Technology
    • Delft Circuits

  • Thomas Connolly

    • Yale University

  • Spencer Diamond

    • Yale University

  • Peter Krogstrup

    • Microsoft Quantum Materials Lab Copenhagen
    • University of Copenhagen and Microsoft Quantum Materials Lab Copenhagen
    • ekrogst@microsoft.com
    • Quantum Materials Lab Copenhagen, Microsoft
    • Microsoft Quantum Materials Lab
    • Center for Quantum Devices, Niels Bohr Institute, University of Copenhagen

  • Jesper Nygard

    • Niels Bohr Institute, University of Copenhagen
    • Center for Quantum Devices, Niels Bohr Institute, University of Copenhagen

  • Attila Geresdi

    • Chalmers University of Technology

  • Leonid Glazman

    • Yale University

  • Michel H Devoret

    • Yale University