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.

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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