Electrodynamic Response of a Solitary Andreev Level – Experimental Measurements

ORAL

Abstract

Andreev levels provide mesoscopic superconductivity systems that are both rich and tractable. While their underlying physics may be revealed through their electrodynamic responses, investigations have so far been limited. Here, we present results on the dynamical response of an intuitive basic system – the Josephson resonant level: a quantum dot with a single weakly-interacting fermionic level tunnel-coupled to two superconducting leads.

In this experimental talk, we describe how the state-dependent inductive response of a Josephson semiconductor nanowire hosting a solitary Andreev level was measured with a superconducting microwave resonator. We observed electrodynamic signatures of two key features of the Josephson resonant level. First, the inductance-phase relation of the continuum part of the superconducting density-of-states is revealed when the level is occupied by a single quasiparticle. Second, Coulomb interactions result in deviations from the occupation rules associated with non-interacting fermionic levels. These results lay foundations for investigating Andreev and Majorana bound states via sensitive circuit quantum electrodynamics tools.

*Work supported by ARO

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Presenters

  • Valla Fatemi

    • Yale University
    • Departments of Applied Physics and Physics, Yale University

Authors

  • Valla Fatemi

    • Yale University
    • Departments of Applied Physics and Physics, Yale University

  • Pavel Kurilovich

    • Yale University
    • Departments of Applied Physics and Physics, Yale University

  • Max Hays

    • Yale University
    • Departments of Applied Physics and Physics, Yale University

  • Nicholas Frattini

    • Yale University
    • Applied Physics Department, Yale University
    • Department of Applied Physics and Physics, Yale University
    • Departments of Applied Physics and Physics, Yale University

  • Daniel Bouman

    • TU Delft
    • QuTech and Kavli Institute of Nanoscience, Delft University of Technology
    • Department of Microtechnology and Nanoscience, Chalmers University

  • Vladislav Kurilovich

    • Yale University
    • Departments of Applied Physics and Physics, Yale University

  • Thomas Connolly

    • University of Massachusetts Amherst
    • Departments of Applied Physics and Physics, Yale University

  • Spencer Diamond

    • TU Delft
    • Yale University
    • Departments of Applied Physics and Physics, Yale University

  • Peter Krogstrup

    • Center for Quantum Devices and Microsoft Quantum Lab Copenhagen, Niels Bohr Institute, University of Copenhagen
    • Microsoft Quantum Materials Lab and Center for Quantum Devices, Niels Bohr Institute,8University of Copenhagen, Kanalvej 7, 2800 Kongens Lyngby, Denmark
    • Niels Bohr Institute, University of Copenhagen
    • Quantum Materials Lab Copenhagen, Microsoft
    • University of Copenhagen
    • Center for Quantum Devices and Microsoft Quantum Lab Copenhagen, Niels Bohr Institute, University of Copenhagen, 2100 Copenhagen, Denmark
    • Center for Quantum Devices, Niels Bohr Institute, University of Copenhagen
    • Microsoft Quantum Materials Lab, University of Copenhagen
    • Niels Bohr Institute, Copenhagen
    • Niels Bohr Institute

  • Jesper Nygard

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

  • Attila Geresdi

    • Chalmers Univ of Tech
    • Chalmers University
    • Quantum Device Physics Laboratory, Department of Microtechnology and Nanoscience, Chalmers University of Technology
    • Department of Microtechnology and Nanoscience, Chalmers University

  • Leonid Glazman

    • Yale University
    • Departments of Applied Physics and Physics, Yale University

  • Michel Devoret

    • Yale University
    • Applied Physics Department, Yale University
    • Yale
    • Department of Applied Physics and Physics, Yale University
    • Applied Physics, Yale University
    • Departments of Applied Physics and Physics, Yale University