Characterization of gate fidelities in a Si/SiGe two-qubit device

ORAL

Abstract

Various candidate implementations for future quantum computers have been investigated over the past twenty years. Silicon spin qubits show great promise [1] for their long coherence times and integration using semiconductor technology but there have been very few quantitative studies of the fidelities of two-qubit gates. Here we characterize the gate fidelities of a C-Phase gate using randomized benchmarking. For single-qubit gates, we perform randomized benchmarking on each spin by itself and also on both spins simultaneously, to probe cross-talk effects. Furthermore, we developed and experimentally verified a new method called character randomized benchmarking [2,3], which combines the advantages of simultaneous and interleaved randomized benchmarking. With this new method, we characterized the fidelity of a C-Phase gate with tighter bounds than those in the traditional approach.

[1] T.F.Watson, et al, Nature 555, 633-637 (2018).
[2] J.Helsen, et al, arxiv:1806.02048.
[3] X.Xue, et al, manuscript in preparation.

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Presenters

  • Xiao Xue

    • QuTech & Kavli Institute of Nanoscience, Delft University of Technology

Authors

  • Xiao Xue

    • QuTech & Kavli Institute of Nanoscience, Delft University of Technology

  • Thomas F Watson

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

  • Jonas Helsen

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

  • Daniel Ward

    • Sandia National Laboratories
    • Sandia Natl Labs
    • University of Wisconsin-Madison

  • Donald E Savage

    • University of Wisconsin-Madison
    • Department of Materials Science and Engineering, University of Wisconsin-Madison

  • Max G Lagally

    • University of Wisconsin-Madison
    • University of Wisconsin
    • Department of Materials Science and Engineering, University of Wisconsin-Madison

  • Susan Coppersmith

    • Department of Physics, University of Wisconsin-Madison
    • University of Wisconsin-Madison
    • University of Wisconsin - Madison

  • Mark Alan Eriksson

    • Department of Physics, University of Wisconsin-Madison
    • University of Wisconsin-Madison
    • University of Wisconsin - Madison

  • Stephanie Wehner

    • QuTech, Delft University of Technology
    • Delft University of Technology
    • Qutech, Delft University of Technology
    • TU Delft
    • Delft Univ of Tech
    • Delft University of Technology, QuTech

  • Lieven Vandersypen

    • QuTech, TU Delft
    • QuTech and Kavli Institute of Nanoscience, Delft University of Technology
    • QuTech and Kavli Institute of NanoScience, TU Delft
    • Delft University of Technology
    • QuTech and Kavli Institute of Nanoscience, TU Delft
    • QuTech & Kavli Institute of Nanoscience, Delft University of Technology