Error mitigation by symmetry verification on a variational quantum eigensolver

ORAL

Abstract

Current efforts to increase the accuracy of quantum algorithms focus on the design and
implementation of low-cost techniques to mitigate the impact of errors while avoiding fully-
fledged error correction schemes. Both simple and comprehensive, variational quantum
eigensolvers provide an excellent platform for exploring error and accuracy trade-offs. We
present the implementation of our own low-cost error detection scheme, named symmetry
verification (SV). We demonstrate an order of magnitude improvement in accuracy while
solving the hydrogen molecule in a transmon quantum processor. Furthermore, by matching
measurements to simulations, we report a breakdown of noise sources with which we
quantify the error mitigating effects of SV and its limitations.

*This research is funded by an ERC Synergy Grant, the Netherlands Organization for
Scientific Research (NWO/OCW), the China Scholarship Council, and IARPA (U.S. Army
Research Office grant W911NF-16-1-0071).

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Presenters

  • Ramiro Sagastizabal

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

Authors

  • Ramiro Sagastizabal

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

  • Xavier Bonet-Monroig

    • Lorentz Institute, Leiden University

  • Malay Singh

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

  • Thomas E O'Brien

    • Lorentz Institute, Leiden University

  • Michiel Adriaan Rol

    • QuTech and Kavli Institute of Nanoscience, Delft University of Technology
    • QuTech and Kavli Institute of Nanoscience, Delft University of Technology, Delft, The Netherlands

  • Cornelis Christiaan Bultink

    • QuTech and Kavli Institute of Nanoscience, Delft University of Technology
    • QuTech and Kavli Institute of Nanoscience, Delft University of Technology, Delft, The Netherlands

  • Xiang Fu

    • QuTech and Quantum Computer Architecture Lab, Delft University of Technology

  • Nandini Muthusubramanian

    • QuTech and Kavli Institute of Nanoscience, Delft University of Technology
    • QuTech and Kavli Institute of Nanoscience, Delft University of Technology, Delft, The Netherlands
    • QuTech and Kavli Institute of Nanoscience Delft, Delft University of Technology

  • Alessandro Bruno

    • QuTech and Kavli Institute of Nanoscience, Delft University of Technology
    • QuTech and Kavli Institute of Nanoscience Delft, Delft University of Technology
    • QuTech and Kavli Institute of Nanoscience, Delft University of Technology, Delft, The Netherlands

  • Leonardo DiCarlo

    • QuTech and Kavli Institute of Nanoscience, Delft University of Technology
    • QuTech and Kavli Institute of Nanoscience, Delft University of Technology, Delft, The Netherlands
    • QuTech and Kavli Institute of Nanoscience Delft, Delft University of Technology