Advanced hybrid InSb/Al nanowires devices for topological parity readout (Part 2)

ORAL

Abstract

Majorana bound states (MBS) are expected to enable topological qubits that encode quantum information with particularly long coherence times. The qubit state is stored non-locally in the fermion parity of multiple pairs of MBS hosted on a semiconducting-superconducting charge island. Interferometric readout of these qubits requires phase-coherent loops that comprise high-mobility InSb nanowires and Al to enable proximity-induced superconductivity in the semiconductor. Here, we introduce a fundamentally new approach for the realization of these hybrid devices based on a novel technique for the selective deposition of the Al thin films. We combine this technique with atomic hydrogen cleaning of the nanowires to remove native oxide prior to the Al deposition. The induced superconductivity in the nanowires is demonstrated via voltage-bias spectroscopy and by probing the critical currents in InSb Josephson junctions. Moreover, Cooper pair tunneling is studied in mesoscopic InSb/Al islands and parity transitions are investigated as a function of the applied magnetic field. Finally, advanced circuits are introduced that allow to study basic elements of the prospective topological qubit.

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Presenters

  • Sebastian Heedt

    Delft University of Technology, QuTech, Delft University of Technology

Authors

  • Sebastian Heedt

    Delft University of Technology, QuTech, Delft University of Technology

  • Marina Quintero Perez

    Microsoft Station Q at Delft University of Technology, Microsoft Station Q Delft, Station Q, Microsoft Research

  • Francesco Borsoi

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

  • Alexandra Fursina

    Microsoft Station Q at Delft University of Technology, Station Q, Microsoft Research

  • Nick van Loo

    Delft University of Technology

  • Jie Shen

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

  • Chien-An Wang

    Delft University of Technology

  • Kevin Van Hoogdalem

    Microsoft Station Q at Delft University of Technology, Microsoft Station Q Delft, Station Q, Microsoft Research

  • Badawy Ghada

    Eindhoven University of Technology, TU Eindhoven

  • Sasa Gazibegovic

    Applied Physics, Eindhoven University of Technology, Eindhoven University of Technology, Applied Physics, Eindhoven Univ. of Technology, Department of Applied Physics, Eindhoven University of Technology, TU Eindhoven, Eindhoven University of Technology, Department of Applied Physics

  • Erik P. A. M. Bakkers

    Applied Physics, Eindhoven University of Technology, Eindhoven University of Technology, Applied Physics, Eindhoven Univ. of Technology, Department of Applied Physics, Eindhoven University of Technology, TU Eindhoven, Eindhoven University of Technology, Department of Applied Physics, Physics, TU Eindhoven

  • Leo P Kouwenhoven

    Microsoft Station Q at Delft University of Technology, Microsoft Quantum Delft, Qutech, Delft University of Technology, QuTech, Delft University of Technology, Station Q Delft, Microsoft, Microsoft Station Q Delft, Microsoft Station-Q at Delft University of Technology, Microsoft Station Q Delft, Delft University of Technology