Diagnosing Errors in Qubit Gates Using Continuous Measurements (Theory)

ORAL

Abstract

We propose a method of characterizing systematic, time-dependent errors in single- and two-qubit gates using continuous weak measurements. By tracking the qubit state throughout the gate operation, we can estimate the time dynamics of unknown parameters in the Hamiltonian. Measurement backaction affects the gate dynamics, but not the parameter estimation. We demonstrate this method on imperfect gates using simulated data, and show that we can reconstruct arbitrary coherent errors, as well as leakage to an unwanted third level.

*We acknowledge funding from US Army Research Office grant no. W911NF-18-10178.

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Presenters

  • John Steinmetz

    • University of Rochester

Authors

  • John Steinmetz

    • University of Rochester

  • Debmalya Das

    • University of Rochester

  • 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

  • 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

  • Andrew N Jordan

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