Superconducting gatemon qubit based on a proximitized two-dimensional electron gas

ORAL

Abstract

The nonlinear inductance generated by Josephson junctions (JJs) is used extensively in quantum information processors based on superconducting circuits. The inductance is either fixed by the metal-oxide dimensions of a single JJ, or magnetically tuned using a superconducting quantum interference device with current-biased flux lines. One tantalizing all-electric alternative are superconductor-semiconductor hybrid JJs with gate-tuneable critical currents. Gatemons have demonstrated the feasibility of this approach using nanowire JJs to control superconducting qubits in the transmon regime [1, 2]. Here we demonstrate that semiconducting channels etched from a wafer-scale two-dimensional electron gas (2DEG) are a natural platform for building a truly scalable gatemon-based universal quantum computer. We show 2DEG gatemons meet the requirements by performing arbitrary voltage-controlled rotations around the Bloch sphere and two-qubit swap operations. We measure qubit lifetimes up to ~2 us, limited by dielectric loss in the 2DEG host substrate.
[1] G. de Lange et al., PRL 115, 127002 (2015); [2] Larsen et al., PRL 115, 127001 (2015).

*Microsoft Project Q, U.S. Army Research Office, Danish National Research Foundation, Marie Curie Fellowship (MRC).

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Presenters

  • Malcolm Connolly

    • Department of Physics, Cavendish Laboratory, University of Cambridge, JJ Thomson Avenue
    • Department of Physics, University of Cambridge
    • Univ of Cambridge
    • Niels Bohr Institute, Univ of Copenhagen

Authors

  • Lucas Casparis

    • Center for Quantum Devices, Station Q Copenhagen, Niels Bohr Institute, University of Copenhagen
    • Center for Quantum Devices and Station Q Copenhagen, Niels Bohr Institute
    • Niels Bohr Institute, Univ of Copenhagen

  • Malcolm Connolly

    • Department of Physics, Cavendish Laboratory, University of Cambridge, JJ Thomson Avenue
    • Department of Physics, University of Cambridge
    • Univ of Cambridge
    • Niels Bohr Institute, Univ of Copenhagen

  • Morten Kjaergaard

    • Massachusetts Inst of Tech-MIT
    • MIT

  • Natalie Pearson

    • Center for Quantum Devices, Station Q Copenhagen, Niels Bohr Institute, University of Copenhagen
    • Niels Bohr Institute, Univ of Copenhagen

  • Anders Kringhøj

    • Center for Quantum Devices, Station Q Copenhagen, Niels Bohr Institute, University of Copenhagen
    • Center for Quantum Devices and Station Q Copenhagen, Niels Bohr Institute
    • Niels Bohr Institute, Univ of Copenhagen

  • Thorvald Larsen

    • Niels Bohr Institute, Univ of Copenhagen

  • Ferdinand Kuemmeth

    • Center for Quantum Devices, Station Q Copenhagen, Niels Bohr Institute, University of Copenhagen
    • Niels Bohr Institute, Univ of Copenhagen
    • Univ of Copenhagen

  • Tiantian Wang

    • Department of Physics and Astronomy and Station Q Purdue, Purdue University
    • Purdue University, Station Q Purdue

  • Sergei Gronin

    • Microsoft Station Q Purdue
    • Purdue University, Station Q Purdue

  • Geoffrey Gardner

    • Department of Physics and Astronomy and Station Q Purdue, Purdue University
    • Microsoft Station Q Purdue
    • Birck Nanotechnology Center, Purdue University
    • Purdue University, Station Q Purdue
    • Purdue Univ
    • Purdue University
    • Physics and Astronomy, Purdue University

  • Michael Manfra

    • Department of Physics and Astronomy and Station Q Purdue, Purdue University
    • Department of Physics and Astronomy and Microsoft Station Q Purdue, Purdue University
    • Purdue University
    • Physics, Purdue University
    • Purdue University, Station Q Purdue
    • Purdue Univ
    • Department of Physics and Astronomy, and School of Materials Engineering, and School of Electrical and Computer Engineering, Purdue University
    • Physics and Astronomy, Purdue University
    • Dept. of Physics and Astronomy, Purdue Univ

  • Charles Marcus

    • Center for Quantum Devices and Microsoft Station Q Copenhagen, Niels Bohr Institute
    • Center for Quantum Devices, Station Q Copenhagen, Niels Bohr Institute, University of Copenhagen
    • Center for Quantum Devices and Station Q Copenhagen, Niels Bohr Institute, University of Copenhagen
    • Center for Quantum Devices and Station Q Copenhagen, Niels Bohr Institute
    • Niels Bohr Institute, Univ of Copenhagen
    • Univ of Copenhagen
    • University of Copenhagen

  • Karl Petersson

    • Center for Quantum Devices, Station Q Copenhagen, Niels Bohr Institute, University of Copenhagen
    • Center for Quantum Devices and Station Q Copenhagen, Niels Bohr Institute
    • Niels Bohr Institute, Univ of Copenhagen
    • Center for Quantum Devices and Station Q Copenhagen, Niels Bohr Institute, University of Copenhagen