Nonlocal signatures of hybridization between quantum dot and Andreev bound state

ORAL

Abstract

Andreev bound states (ABS) in semiconductor-superconductor hybrid structures have attracted considerable attention in the past decade.
We present a novel device geometry based on a semiconducting InAs two-dimensional electron gas proximitized by superconducting Al. The device allows for tunneling spectroscopy at the ends of a gate-defined nanowire with a grounded parent superconductor.
Preliminary results from a 600 nm long nanowire show that ABS can be induced and controlled in the nanowire by electrostatic gating. The bound states appear correlated at both ends of the nanowire in tunneling spectroscopy. To further demonstrate the high level of control, the ABS in the nanowire is brought on resonance with a local quantum-dot level. The effect of the resulting hybridization on the bound state is observed at the other end of the nanowire, which strongly indicates that we are indeed measuring an extended quantum state at two separate locations.

*Funding acknowledgment: Research supported by Microsoft Station Q and the Danish National Research Foundation

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Presenters

  • Andreas Pöschl

    • Niels Bohr Institute, Microsoft Station Q, University of Copenhagen, Universitetsparken 5, 2100 Copenhagen, Denmark

Authors

  • Andreas Pöschl

    • Niels Bohr Institute, Microsoft Station Q, University of Copenhagen, Universitetsparken 5, 2100 Copenhagen, Denmark

  • Alisa Danilenko

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

  • Deividas Sabonis

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

  • Kaur Kristjuhan

    • Niels Bohr Institute, Microsoft Station Q, University of Copenhagen, Universitetsparken 5, 2100 Copenhagen, Denmark

  • Tyler Lindemann

    • Department of Physics and Astronomy and Microsoft Quantum Purdue, Purdue University, West Lafayette, Indiana 47907 USA
    • Purdue University, Microsoft Station Q, West Lafayette, Indiana 47907, USA
    • Department of Physics and Astronomy, Purdue University

  • Sergei Gronin

    • Purdue University, Microsoft Station Q, West Lafayette, Indiana 47907, USA
    • Birck Nanotechnology Center and Microsoft Quantum Purdue, Purdue University

  • Geoffrey C. Gardner

    • Purdue University
    • Purdue Univ
    • Microsoft Quantum at Station Q Purdue, Purdue University
    • Purdue University, Microsoft Station Q, West Lafayette, Indiana 47907, USA
    • Microsoft Quantum at station Q Purdue
    • Microsoft Station Q Purdue, Purdue University
    • Birck Nanotechnology Center and Microsoft Quantum Purdue, Purdue University

  • Candice Thomas

    • Department of Physics and Astronomy and Microsoft Quantum Purdue, Purdue University, West Lafayette, Indiana 47907 USA
    • Department of Physics and Astronomy and Station Q Purdue, Purdue University
    • CEA, LETI, MINATEC Campus, 38054 Grenoble, France
    • Department of Physics and Astronomy, Purdue University

  • Michael Manfra

    • Purdue University
    • Purdue Univ
    • Department of Physics and Astronomy and Microsoft Quantum Purdue, Purdue University, West Lafayette, Indiana 47907 USA
    • Department of Physics and Astronomy and Station Q Purdue, Purdue University
    • Niels Bohr Institute, Microsoft Station Q, University of Copenhagen, Universitetsparken 5, 2100 Copenhagen, Denmark
    • Department of Physics and Astronomy, Purdue University
    • Birck Nanotechnology Center and Microsoft Quantum Purdue, Purdue University

  • Charles M Marcus

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