Calibration of Coherent Errors using Different Gatesets

ORAL

Abstract

Achieving fault tolerant operation of a quantum processor requires creating high-fidelity qubit gates. We study the impact of coherent errors from phase evolution of the control waveform on gate fidelity for several gatesets, using randomized benchmarking (RB) and gateset tomography (GST) protocols to find the error per physical gate and angle error between gates. The undesired phase distortion rotates the effective axes of rotation off of the Bloch sphere equatorial plane. Our results show that gateset choice when performing RB and GST can obfuscate or amplify the error between axes. Predistortion of the signal can reverse the effects of the phase evolution, rotating the effective axes of rotation back to their desired positions and improving the fidelity of the resulting gates.

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Presenters

  • Timothy M Sweeney

    • Johns Hopkins University Applied Physics
    • Johns Hopkins University Applied Physics Lab

Authors

  • Mayra Amezcua

    • Johns Hopkins University Applied Physics

  • Christopher Watson

    • Johns Hopkins University Applied Physics Laboratory
    • Johns Hopkins University Applied Physics Lab

  • Andrew J Murphy

    • Johns Hopkins University Applied Physics Laboratory

  • Jacob E Epstein

    • Johns Hopkins University Applied Physics Laboratory

  • Kyle McElroy

    • Applied Phys Lab/JHU

  • Kevin Schultz

    • Applied Phys Lab/JHU

  • Timothy M Sweeney

    • Johns Hopkins University Applied Physics
    • Johns Hopkins University Applied Physics Lab

  • Tom Gilliss

    • Johns Hopkins University Applied Physics Laboratory
    • Johns Hopkins University Applied Physics Lab