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.

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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