Engineering Dynamical Sweet Spots to Protect Qubits from 1/f Noise

ORAL

Abstract

Protecting superconducting qubits from low-frequency noise is important for advancing superconducting quantum computation. We present a protocol for engineering dynamical sweet spots protecting against 1/f noise, using a periodic drive. The position and strength of dynamical sweet spots can be obtained analytically in the framework of Floquet theory. For the example of fluxonium biased slightly away from half a flux quantum, we predict an improvement in pure-dephasing time from less than 1 μs to over 1 ms. Using the Floquet eigenstates as the computational basis, we show that high-fidelity single-qubit gates can be implemented at dynamical sweet spots. We further confirm that qubit readout can be performed by adiabatically mapping the qubit's Floquet states to the static qubit states, and subsequently employing standard measurement techniques.

*Army Research Office Grant No. W911NF1910016

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Presenters

  • Ziwen Huang

    • Northwestern University
    • Physics, Northwestern University

Authors

  • Ziwen Huang

    • Northwestern University
    • Physics, Northwestern University

  • Andras Gyenis

    • Princeton University
    • Department of Electrical Engineering, Princeton University

  • Pranav Mundada

    • Princeton University
    • Department of Electrical Engineering, Princeton University
    • Electrical Engineering, Princeton University

  • David I Schuster

    • University of Chicago
    • Physics, University of Chicago
    • Department of Physics and the James Franck Institute, University of Chicago
    • The James Franck Institute and Department of Physics, University of Chicago
    • The James Franck Institute and Department of Physics, The University of Chicago

  • Andrew Houck

    • Princeton University
    • Electrical Engineering, Princeton University
    • Department of Electrical Engineering, Princeton University

  • Jens Koch

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