Radio frequency methods for Majorana based quantum computing: fast charge sensing and phase diagram mapping

ORAL

Abstract

We employ radio frequency techniques to demonstrate two measurements: first, by embedding an InAs/Al nanowire directly into a resonant circuit, it is possible to map key features of the conductance vs. gate-voltage phase diagram approximately 40 times faster than conventional lock-in methods; second, by capacitively coupling the same nanowire to a radio-frequency single electron transistor, fabricated from another nanowire, we demonstrate detection of single electron inter-island transitions, with signal-to-noise ratios exceeding 5 for an integration time below 1 μs at axial (parallel to nanowire) magnetic fields of 0.6T. Latter results will be the requirements for implementing Majorana based quantum computation in hybrid superconductor-semiconductor nanowire devices, and demonstrates the full compatibility of the high-bandwidth sensing techniques. Presented device geometries are similar to that have previously shown signatures of Majorana-like bound states.

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Presenters

  • Davydas Razmadze

    Center for Quantum Devices, Niels Bohr Institute, University of Copenhagen

Authors

  • Davydas Razmadze

    Center for Quantum Devices, Niels Bohr Institute, University of Copenhagen

  • Deividas Sabonis

    Center for Quantum Devices, Niels Bohr Institute, University of Copenhagen

  • Filip Malinowski

    Delft University of Technology, University of Copenhagen, QuTech and Kavli Institute of Nanoscience, Delft University of Technology, Center for Quantum Devices, Niels Bohr Institute, QuTech and Kavli Institute of Nanoscience, Delft University of Technology, Delft, The Netherlands

  • Gerbold Menard

    University of Copenhagen, Center for Quantum Devices, Niels Bohr Institute

  • Sebastian Pauka

    School of Physics, The University of Sydney, School of Physics, Univ of Sydney, ARC Centre of Excellence for Engineered Quantum Systems, The University of Sydney

  • Hung Nguyen

    Center for Quantum Devices, Niels Bohr Institute

  • David Van Zanten

    Center for Quantum Devices, Niels Bohr Institute, University of Copenhagen

  • Eoin C O'Farrell

    Center for Quantum Devices and Station Q Copenhagen, Niels Bohr Institute, University of Copenhagen, Universitetsparken 5, 2100 Copenhagen, Denmark, Center for Quantum Devices, Niels Bohr Institute, University of Copenhagen, Center for Quantum Devices and Station Q Copenhagen, University of Copenhagen

  • Judith Tabea Suter

    Center for Quantum Devices, Niels Bohr Institute, University of Copenhagen

  • Peter Krogstrup

    Niels Bohr Institute, Center for Quantum Devices and Microsoft Quantum Lab--Copenhagen, Niels Bohr Institute, University of Copenhagen, Center for Quantum Devices, Niels Bohr Institute, Center for Quantum Devices and Station-Q Copenhagen, Niels Bohr Institute, University of Copenhagen, Center for Quantum Devices, Niels Bohr Institute, University of Copenhagen, Station Q, Microsoft, Microsoft Corp

  • Ferdinand Kuemmeth

    Niels Bohr Institute, Center for Quantum Devices, Niels Bohr Institute

  • Charles M Marcus

    Microsoft, Center for Quantum Devices and Station Q Copenhagen, Niels Bohr Institute, University of Copenhagen, Center for Quantum Devices, University of Copenhagen, Center for Quantum Devices and Station Q Copenhagen, Niels Bohr Institute, University of Copenhagen, Universitetsparken 5, 2100 Copenhagen, Denmark, Center for Quantum Devices and Microsoft Quantum Lab--Copenhagen, Niels Bohr Institute, University of Copenhagen, Niels Bohr Institute, University of Copenhagen, Niels Bohr Institute, Center for Quantum Devices, Niels Bohr Institute, Center for Quantum Devices, Station Q Copenhagen, Niels Bohr Institute, University of Copenhagen, Center for Quantum Devices and Microsoft Quantum Lab–Copenhagen, Niels Bohr Institute, University of Copenhagen, 2100 Copenhagen, Denmark, University of Copenhagen, Center for Quantum Devices and Station Q Copenhagen, University of Copenhagen