Coupling Quantum Dots to 2DEG-Based Superconductor-Semiconductor Hybrids

ORAL

Abstract

We present experimental results for gate-defined lateral quantum dots coupled to a superconductor-semiconductor nanowire based on InAs/Al two-dimensional electron gas (2DEG). We demonstrate independent voltage control of coupling of multiple quantum dots to the superconducting wire on one side and normal semiconducting leads on the other. This provides experimental control of hybridization of discrete dot states to subgap Andreev states in the wire [1,2] and a tool for high-resolution spectroscopy of Andreev states [3], as well as a possibility to use the dots as filters [4]. A high degree of experimental control as well as extension to a variety of device geometries is made possible by the hybrid 2DEG platform.

[1] D. Clarke, Phys. Rev. B 96, 201109(R) (2017)

[2] E. Prada et al, Phys. Rev. B 96, 085418 (2017)

[3] F. Thomas et al, Phys. Rev. B 104, 115415 (2021)

[4] G. Wang, T. Dvir et al, arXiv:2110.05373 (2021)

*Research supported by Microsoft, the Danish National Research Foundation, and the Villum Foundation.

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Presenters

  • Alisa Danilenko

    • Center for Quantum Devices, Niels Bohr Institute, University of Copenhagen, 2100 Copenhagen, Denmark
    • Univ of Copenhagen

Authors

  • Alisa Danilenko

    • Center for Quantum Devices, Niels Bohr Institute, University of Copenhagen, 2100 Copenhagen, Denmark
    • Univ of Copenhagen

  • Andreas S Pöschl

    • Center for Quantum Devices, Niels Bohr Institute, University of Copenhagen, 2100 Copenhagen, Denmark

  • Deividas Sabonis

    • ETH Zurich
    • Center for Quantum Devices, Niels Bohr Institute, University of Copenhagen, Universitetsparken 5, 2100 Copenhagen, Denmark, Laboratory for Solid State Physics, ETH Zürich

  • Tyler Lindemann

    • Department of Physics and Astronomy, Birck Nanotechnology Center, and Microsoft Quantum Lab Purdue, Purdue University
    • Purdue University, Microsoft Quantum Materials Lab-Purdue, West Lafayette, Indiana 47907, USA
    • Purdue University

  • Sergei Gronin

    • Purdue University, Microsoft Quantum Materials Lab-Purdue, West Lafayette, Indiana 47907, USA
    • Microsoft Quantum Materials Lab-Purdue
    • Purdue University

  • Geoffrey C Gardner

    • Purdue University
    • Purdue University, Microsoft Quantum Materials Lab-Purdue, West Lafayette, Indiana 47907, USA)
    • Microsoft Quantum Materials Lab-Purdue

  • Candice Thomas

    • Purdue University
    • Purdue University, Microsoft Quantum Materials Lab-Purdue, West Lafayette, Indiana 47907, USA
    • CEA

  • Michael J Manfra

    • Department of Physics and Astronomy, Birck Nanotechnology Center, and Microsoft Quantum Lab Purdue, Purdue University
    • Purdue University
    • Purdue University, West Lafayette, Indiana 47907, USA

  • Charles M Marcus

    • Center for Quantum Devices, Niels Bohr Institute, University of Copenhagen, Copenhagen Denmark.
    • Center for Quantum Devices, Niels Bohr Institute, University of Copenhagen, Universitetsparken 5, 2100 Copenhagen, Denmark
    • Univ of Copenhagen