A gate-tunable, field-compatible fluxonium

ORAL

Abstract

Hybrid superconducting circuits, which integrate non-superconducting elements into a circuit quantum electrodynamics (cQED) architecture, expand the possible applications of cQED and provide new insights into mesoscopic superconductivity. Extending the capabilities of hybrid flux-based circuits, which provide access to current-phase relations, to work in magnetic fields would be especially useful both as a probe of spin-polarized Andreev bound states and as a platform for topological qubits. Here, we present a new hybrid circuit: a magnetic-field
compatible fluxonium with an electrostatically-tuned semiconducting nanowire as its non-linear element. We demonstrate in-situ gate-control of the Josephson energy of the fluxonium over more than an order of magnitude. We also operate the fluxonium in magnetic fields up to 1T, where we observe the anomalous Josephson effect. This combination of gate-tunability and field-compatibility opens avenues for the exploration and control of spin-polarized phenomena using superconducting circuits and enables the use of the fluxonium as a readout device for topological qubits.

*Research co-funded by the allowance for Top consortia for Knowledge and Innovation (TKI’s) from the Dutch Ministry of Economic Affairs and the Microsoft Quantum initiative.

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Presenters

  • Marta Pita-Vidal

    • QuTech, Delft University of Technology
    • Delft University of Technology

Authors

  • Marta Pita-Vidal

    • QuTech, Delft University of Technology
    • Delft University of Technology

  • Arno Bargerbos

    • QuTech, Delft University of Technology
    • Delft University of Technology

  • Chung-Kai Yang

    • Quantum Lab Delft, Microsoft
    • Microsoft Corp

  • David J. Van Woerkom

    • Microsoft Quantum Lab Delft, Delft University of Technology
    • Quantum Lab Delft, Microsoft
    • Microsoft Corp

  • Wolfgang Pfaff

    • Quantum Lab Delft, Microsoft
    • Microsoft Quantum Lab Delft, Delft University of Technology
    • Microsoft Corp

  • Nadia Haider

    • QuTech and TNO, The Netherlands
    • Netherlands Organisation for Applied Scientific Research (TNO
    • Netherlands Organization for Applied Scientific Research

  • Peter Krogstrup

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

  • Leo P Kouwenhoven

    • Dept. of Physics, Technical University, Delft, The Netherlands
    • Microsoft Quantum Lab Delft
    • Microsoft Quantum Lab Delft, Delft University of Technology
    • Microsoft Corp Delft
    • Quantum Lab Delft, Microsoft
    • Delft University of Technology
    • QuTech and Kavli Institute of Nanoscience, Delft University of Technology
    • Microsoft Corp

  • Gijs De Lange

    • Microsoft Quantum Lab Delft, 2628 CJ, Delft, The Netherlands
    • Quantum Lab Delft, Microsoft
    • Applied Physics, Yale University
    • QuTech and Kavli Institute of Nanoscience, Delft University of Technology
    • Microsoft Corp

  • Angela Kou

    • Quantum Lab Delft, Microsoft
    • Microsoft Corp