Time-resolved measurement of quaiparticle tunneling between two Andreev levels in quantum dots

ORAL

Abstract

We investigate a triple-quantum-dot InAs nanowire device. The central dot is proximitized by a superconducting aluminum shell. The superconducting proximity effect indirectly leads to a formation of Andreev levels in the two normal end dots, located 2 μm apart. By means of radio-frequency dispersive sensing we measure individual quasiparticle jumps between those two Andreev levels separated by a hard-gapped superconducting island. We discuss whether the quasiparticle jumps originate from coherent tunneling or from quasiparticle poisoning, and the implications for the qubits based on hybrid super-semiconducting nanowires.

*This work has been financially supported by the Dutch Organization for Scientific Research (NWO), the Foundation for Fundamental Research on Matter (FOM) and Microsoft Corporation Station Q.

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Presenters

  • Filip Malinowski

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

Authors

  • Filip Malinowski

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

  • Damaz De Jong

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

  • Lin Han

    • Delft University of Technology
    • Drexel University, School of biomedical Engineering
    • QuTech and Kavli Institute of Nanoscience, Delft University of Technology
    • QuTech, Delft University of Technology

  • Christian Prosko

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

  • Yu Liu

    • Niels Bohr Institute, University of Copenhagen
    • Microsoft Quantum Materials Lab, University of Copenhagen
    • Niels Bohr Institute

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

  • Jonne Koski

    • Microsoft Quantum Lab Delft