Gate-tunable Transmon Qubit made with Graphene/hBN Heterostructures

ORAL

Abstract

Graphene – an atomic layer of carbon atoms arranged in a honeycomb lattice – can acquire superconductivity via the proximity effect. We present the fabrication and characterization of a transmon qubit using graphene as a voltage-tunable weak link. The graphene monolayer is encapsulated in hBN crystals from both sides and couples to aluminum electrodes via etched 1-D edges to ensure highly transparent contacts. The critical supercurrent of the S-G-S junction is tuned by an underlying back-gate fabricated on the qubit chip. Using standard dispersive readout techniques, we observe that the frequency and coherence of our qubit exhibit an evident dependence on the Fermi energy – controlled by the back-gate – as expected for graphene weak links. Our result opens a new avenue toward voltage-controlled superconducting qubits, with relevance to certain scalable quantum computing concepts, as well as a novel platform to study mesoscopic physics using circuit QED techniques.

*This work was sponsored in part by the Assistant Secretary of Defense for Research and Engineering under Air Force Contract FA8721-05-0002. Opinions, interpretations, conclusions, and recommendations are those of the authors and are not necessarily endorsed by the United States Government.

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Presenters

  • Joel Wang

    • Research Laborotary of Electronics, Massachusetts Institute of Technology

Authors

  • Joel Wang

    • Research Laborotary of Electronics, Massachusetts Institute of Technology

  • Daniel Rodan Legrain

    • Department of Physics, Massachusetts Institute of Technology

  • Landry Bretheau

    • Department of Physics, Ecole Polytechnique

  • Fei Yan

    • Research Laborotary of Electronics, Massachusetts Institute of Technology
    • Research Laboratory of Electronics, Massachusetts Institute of Technology
    • Research Laboratory of Electronics, Massachusetts institute of Technology

  • Morten Kjærgaard

    • Research Laborotary of Electronics, Massachusetts Institute of Technology
    • Research Laboratory of Electronics, Massachusetts Inst of Tech-MIT

  • David Kim

    • MIT Lincoln Laboratory
    • MIT Lincoln Lab
    • Lincoln Laboratory, Massachusetts Institute of Technology
    • Massachusetts Inst of Tech-MIT
    • Lincoln Laboratory, Massachusetts Inst of Tech-MIT

  • Jonilyn Yoder

    • MIT Lincoln Laboratory
    • MIT Lincoln Lab
    • Lincoln Laboratory, Massachusetts Institute of Technology
    • Massachusetts Inst of Tech-MIT
    • Lincoln Laboratory, Massachusetts Inst of Tech-MIT

  • Gabriel Samach

    • Lincoln Laboratory, Massachusetts Institute of Technology
    • MIT Lincoln Lab
    • MIT Lincoln Laboratory

  • Daniel Campbell

    • Research Laborotary of Electronics, Massachusetts Institute of Technology
    • Research Laboratory of Electronics, Massachusetts Institute of Technology

  • Philip Krantz

    • Microtechnology and nanoscience, Chalmers University of Technology
    • Research Laborotary of Electronics, Massachusetts Institute of Technology
    • Massachusetts Inst of Tech-MIT
    • Research Laboratory of Electronics, Massachusetts Inst of Tech-MIT
    • Research Laboratory of Electronics, Massachusetts Institute of Technology

  • Kenji Watanabe

    • National Institute for Materials Science
    • NIMS
    • National Institute for Material Science
    • Advanced Materials Laboratory, National Institute for Materials Science
    • National Institute of Materials Science
    • Research Center for Functional Materials, National Institute for Materials Science
    • National Institute for Materials Science (NIMS
    • Advanced Materials Laboratory, NIMS
    • National Institute for Materials Science, Advanced Materials Laboratory
    • National Institue for Materials Science
    • National Institute of Material Science
    • National Institute for Matericals Science
    • Advanced Materials Laboratory
    • National Institute for Materials Science, 1-1 Namiki
    • Advanced materials laboratory, National institute for Materials Science
    • NIMS-Japan

  • Takashi Taniguchi

    • National Institute for Materials Science
    • NIMS
    • National Institute for Material Science
    • Advanced Materials Laboratory, National Institute for Materials Science
    • National Institute of Materials Science
    • Research Center for Functional Materials, National Institute for Materials Science
    • National Institute for Materials Science (NIMS
    • Advanced Materials Laboratory, NIMS
    • National Institute for Materials Science, Advanced Materials Laboratory
    • National Institue for Materials Science
    • National Institute of Material Science
    • National Institute for Matericals Science
    • Advanced Materials Laboratory
    • National Institute for Materials Science, 1-1 Namiki
    • NIMS-Japan

  • Terry Orlando

    • Department of Electrical Engineering and Computer Science, Research Laboratory of Electronics, Massachusetts Institute of Technology
    • MIT
    • Department of Electrical Engineering and Computer Science, Research Laboratory of Electronics, Massachusetts institute of Technology

  • Simon Gustavsson

    • Massachusetts Institute of Technology
    • Research Laborotary of Electronics, Massachusetts Institute of Technology
    • Massachusetts Inst of Tech-MIT
    • Research Laboratory of Electronics, Massachusetts Institute of Technology
    • Research Laboratory of Electronics, Massachusetts Inst of Tech-MIT
    • MIT
    • Research Laboratory of Electronics, Massachusetts institute of Technology

  • Pablo Jarillo-Herrero

    • Massachusetts Inst of Tech-MIT
    • Department of Physics, Massachusetts Institute of Technology
    • Physics, MIT
    • MIT
    • Massachusetts Institute of Technology

  • William Oliver

    • MIT Lincoln Laboratory
    • MIT Lincoln Lab
    • Massachusetts Institute of Technology & MIT Lincoln Laboratory
    • Department of Physics, Research Laboratory of Electronics, Lincoln Laboratory, Massachusetts Institute of Technology
    • Massachusetts Inst of Tech-MIT
    • Department of Physics, Research Laboratory of Electronics, Lincoln Laboratory, Massachusetts Inst of Tech-MIT
    • MIT
    • Lincoln Laboratory, Research Laboratory of Electronics, and Department of Physics, Massachusetts Institute of Technology
    • Department of Physics, Research Laboratory of Electronics, Lincoln Laboratory, Massachusetts institute of Technology