Adaptive quantum annealing based on weak measurements to suppress the errors due to Landau-Zener transitions

ORAL

Abstract

Quantum annealing is undermined by Landau-Zener transitions from the ground to the first excited state around small energy gaps. This kind of error can be suppressed by slowing down quantum annealing near the minimum gap. We study the relationship between the minimum gap and potential observables that can be used to gain information on the minimum gap using weak measurements. The measurement of energy curvature is promising as a measure of the location of the minimum gap. We apply master equations for the quantum annealing monitored by weak measurements to study the impacts of noise. The simulations show that Landau-Zener type errors can be suppressed by making the rate of quantum annealing dependent on monitoring with weak measurements.

*This material is based upon work supported by the Intelligence Advanced Research Projects Activity (IARPA) and the Army Research Office (ARO) under Contract No. W911NF-17-C-0050. Any opinions, findings and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the Intelligence Advanced Research Projects Activity (IARPA) and the Army Research Office (ARO).

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Presenters

  • Yongchao Tang

    • Institute for Quantum Computing, University of Waterloo
    • University of Waterloo
    • Institute for Quantum Computing, Department of Physics and Astronomy, and Waterloo Institute for Nanotechnology, University of Waterloo
    • Physics and Astronomy, Institute for Quantum Computing, Waterloo Institute for Nanotechnology, University of Waterloo

Authors

  • Yongchao Tang

    • Institute for Quantum Computing, University of Waterloo
    • University of Waterloo
    • Institute for Quantum Computing, Department of Physics and Astronomy, and Waterloo Institute for Nanotechnology, University of Waterloo
    • Physics and Astronomy, Institute for Quantum Computing, Waterloo Institute for Nanotechnology, University of Waterloo

  • Antonio Martinez

    • University of Waterloo
    • Institute for Quantum Computing, Department of Physics and Astronomy, and Waterloo Institute for Nanotechnology, University of Waterloo
    • Physics and Astronomy, Institute for Quantum Computing, Waterloo Institute for Nanotechnology, University of Waterloo

  • Song Zhang

    • University of California, Berkeley
    • Berkeley Quantum Information & Computation Center, University of California, Berkeley

  • Juan Atalaya

    • University of California, Berkeley
    • Univ of California - Berkeley
    • Berkeley Quantum Information & Computation Center, University of California, Berkeley

  • Birgitta K Whaley

    • University of California, Berkeley
    • Berkeley Quantum Information & Computation Center, University of California, Berkeley
    • Univ of California - Berkeley

  • Adrian Lupascu

    • University of Waterloo
    • Institute for Quantum Computing, Department of Physics and Astronomy, and Waterloo Institute for Nanotechnology, University of Waterloo
    • Physics and Astronomy, Institute for Quantum Computing, Waterloo Institute for Nanotechnology, University of Waterloo