Drive-induced renormalization of Kerr nonlinearity in superconducting circuits

ORAL

Abstract

Josephson-junction-based amplifiers are now ubiquitously used in high-fidelity qubit readout. In a three-wave mixing parametric amplifier, a cancelation of the Kerr interaction is required. In satisfying this requirement, an important limitation is that available theory does not fully explain the dependence of the Kerr nonlinearity on drive power. We propose a perturbative expansion based on unitary transformations to calculate drive-induced corrections to Kerr interactions, with possible applications to current experiments.

*This work was undertaken thanks in part to funding from NSERC and the Canada First Research Excellence Fund.

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Presenters

  • Alexandru Petrescu

    • Département de Physique, Université de Sherbrooke
    • Universite de Sherbrooke

Authors

  • Alexandru Petrescu

    • Département de Physique, Université de Sherbrooke
    • Universite de Sherbrooke

  • Baptiste Royer

    • Department of Physics, Yale University
    • Universite de Sherbrooke

  • Alexandre Blais

    • Universite de Sherbrooke
    • Institut quantique and Departement de Physique, Universite de Sherbrooke
    • Institut Quantique, Universite de Sherbrooke
    • Département de Physique, Université de Sherbrooke
    • Institut quantique & Département de Physique, Université de Sherbrooke
    • Institut Quantique and Departement de Physique, Universite de Sherbrooke, Sherbrooke, Canada
    • Institut quantique and Département de Physique, Universite de Sherbrooke