Diagnosing Gate Errors in Superconducting Qubits Using Continuous Measurements (Experiment)

ORAL

Abstract

Coherent gate errors form an obstacle for successful execution of quantum algorithms on superconducting quantum computers. Improving both single and two-qubit gate fidelities
requires an accurate model of the qubit dynamics in response to the applied control pulse. In this work, we use continuous measurement of a superconducting qubit to continuously track the qubit state during a gate, and reconstruct the magnitude and type of error from measured voltage records. We demonstrate this method on imperfect gates, and show that the reconstructed dynamics accurately reveals both the dynamics due to the applied control pulse and errors such as over-rotations and leakage out of the computational subspace.

*This work was supported by the Army Research Office and the Office of Advanced Scientific Computing Research, Office of Science of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231.

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Presenters

  • Gerwin Koolstra

    • Lawrence Berkeley National Laboratory
    • University of California, Berkeley

Authors

  • Gerwin Koolstra

    • Lawrence Berkeley National Laboratory
    • University of California, Berkeley

  • Noah Stevenson

    • Univ of California – Berkeley
    • University of California, Berkeley
    • Univ of California - Berkeley

  • Karthik Siva

    • University of California, Berkeley
    • Univ of California – Berkeley
    • Univ of California - Berkeley

  • William Livingston

    • University of California, Berkeley
    • Univ of California – Berkeley
    • Univ of California - Berkeley

  • Ravi K. Naik

    • University of California, Berkeley
    • Univ of California – Berkeley
    • Physics, University of California, Berkeley
    • University of California Berkeley
    • Univ of California - Berkeley
    • Quantum Nanoelectronics Laboratory, Dept. of Physics, University of California, Berkeley
    • University of California - Berkeley

  • John Steinmetz

    • University of Rochester

  • Debmalya Das

    • University of Rochester

  • Andrew N Jordan

    • University of Rochester
    • Department of Physics and Astronomy, University of Rochester

  • David Ivan Santiago

    • Lawrence Berkeley National Laboratory
    • University of California, Berkeley
    • Lawrence Berkely National Laboratory
    • Quantum Nanoelectronics Laboratory, Dept. of Physics, University of California, Berkeley

  • Irfan Siddiqi

    • Lawrence Berkeley National Laboratory
    • University of California, Berkeley
    • Univ of California - Berkeley
    • Univ of California – Berkeley
    • Quantum Nanoelectronics Lab, UC Berkeley
    • Physics, University of California, Berkeley
    • Quantum Nanoelectronics Laboratory, Dept. of Physics, University of California, Berkeley