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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.

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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