Microwave Andreev bound state spectroscopy of a nanowire Josephson junction in magnetic fields

ORAL

Abstract

Microwave spectroscopy of Andreev bound states (ABS) in hybrid superconducting circuit-QED has so far been limited to magnetic fields of a few tens of mT. In contrast to ABS transitions involving pairs of quasiparticles, transitions involving a single spin-carrying quasiparticle to higher lying ABS have been observed and manipulated recently. Here, we expand on these results by performing microwave spectroscopy of a gate-tunable InAs-Al hybrid weak link in presence of spin-orbit coupling and Zeeman fields. In parallel fields up to 250 mT we track both even and odd fermion parity branches of the spectrum. Additionally, in junctions with broken chiral and time-reversal symmetry, through spin-orbit coupling and magnetic field respectively, an anomalous Josephson current is expected to appear. In contrast to measurements of this aggregate effect, we show a field induced anomalous phase shift in transitions between individual Andreev bound states. Finally, the ability to perform microwave spectroscopy of ABS in magnetic fields is requisite for probing signatures of the 4-pi periodic Josephson effect directly in the ABS spectrum and can serve as a platform for Andreev spin based qubits.

*Is supported by funding from the Dutch Research Council (NWO) and the Microsoft Quantum initiative.

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Presenters

  • Jaap Wesdorp

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

Authors

  • Jaap Wesdorp

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

  • Arjen Vaartjes

    • Qutech, Delft University of Technology

  • Sebastiaan Roelofs

    • Qutech, Delft University of Technology

  • Lukas Gruenhaupt

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

  • Marta Pita Vidal

    • Qutech, Delft University of Technology

  • Arno Bargerbos

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

  • Lukas Splithoff

    • Qutech, Delft University of Technology

  • David J. Van Woerkom

    • Quantum Lab Delft, Microsoft
    • Quantum lab Delft, Microsoft

  • 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

  • Leo Kouwenhoven

    • Microsoft station Q Delft
    • Microsoft Station Q Delft
    • Quantum Lab Delft, Microsoft
    • Microsoft Quantum Lab Delft
    • Quantum lab Delft, Microsoft
    • Microsoft Corp
    • Station Q Delft, Microsoft

  • Bernard Van Heck

    • Quantum Lab Delft, Microsoft
    • Microsoft
    • Quantum lab Delft, Microsoft
    • Microsoft Quantum Lab Delft, Delft University of Technology, 2600 GA Delft, The Netherlands

  • Gijs De Lange

    • Quantum Lab Delft, Microsoft
    • Quantum lab Delft, Microsoft
    • Microsoft Corp