Single-shot readout of spin-orbit-split Andreev doublets: motivation and setup

ORAL

Abstract

Modern efforts towards constructing exotic superconducting qubits such as Andreev spin qubits and Majorana bound states hinges on spin-orbit coupling. The physics of these unique quantum systems may be explored using the well-developed microwave techniques of circuit QED, which can yield sharp spectral resolution and time-domain information. Here we report on measurements of long InAs-nanowire Josephson junctions embedded in a circuit QED architecture. The Andreev bound state spectrum includes transitions which correspond to the transfer of a single quasiparticle between two spin-orbit-split Andreev doublets. Some of these transitions exhibit large coupling to the on-chip resonator. Thus, fast, time-domain measurement of the many-body state of the junction can be achieved through dispersive readout. In this first part of a joint presentation, we will present the background and motivation, as well as the experimental setup and a theoretical model for our system.

*Work supported by ARO, ONR, NSF, and AFOSR

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Presenters

  • Valla Fatemi

    • Department of Physics, Massachusetts Institute of Technology
    • Massachusetts Institute of Technology
    • Yale Univ
    • Applied Physics, Yale University
    • Department of Applied Physics, Yale University

Authors

  • Valla Fatemi

    • Department of Physics, Massachusetts Institute of Technology
    • Massachusetts Institute of Technology
    • Yale Univ
    • Applied Physics, Yale University
    • Department of Applied Physics, Yale University

  • Max Hays

    • Yale Univ
    • Applied Physics, Yale University
    • Department of Applied Physics, Yale University

  • Kyle Serniak

    • Applied Physics, Yale University
    • Yale Univ
    • Department of Applied Physics, Yale University

  • Daniël Bouman

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

  • Gijs De Lange

    • Microsoft Quantum Delft
    • Yale Univ
    • Station Q Delft, Microsoft
    • Microsoft Station Q Delft, Delft University of Technology

  • Spencer Diamond

    • Yale Univ
    • Applied Physics, Yale University
    • Department of Applied Physics, Yale University

  • Peter Krogstrup

    • Center for Quantum Devices and Microsoft Quantum Lab–Copenhagen, Niels Bohr Institute, University of Copenhagen, 2100 Copenhagen, Denmark
    • Station Q Lyngby, Microsoft
    • Center for Quantum Devices, Niels Bohr Institute, University of Copenhagen
    • Center For Quantum Devices and Microsoft Quantum Materials Lab - Copenhagen, Niels Bohr Institute, University of Copenhagen

  • Jesper Nygård

    • Niels Bohr Institute
    • Center for Quantum Devices
    • Center for Quantum Devices and Station-Q Copenhagen, Niels Bohr Institute, University of Copenhagen
    • Center for Quantum Devices, Niels Bohr Institute, University of Copenhagen
    • Center for Quantum Devices and Station Q Copenhagen, University of Copenhagen
    • Center for Quantum Devices and Station Q Copenhagen, Niels Bohr Institute

  • Attila Geresdi

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

  • Michel H. Devoret

    • Yale Univ
    • Applied Physics, Yale University
    • Department of Applied Physics, Yale University
    • Department of Applied Physics, Yale University, New Haven, Connecticut 06511, USA