Drive-induced dephasing in circuit QED

ORAL

Abstract

The transmon succeeded the Cooper-pair box by trading a smaller anharmonicity for an exponential reduction of the sensitivity to charge noise. Despite this reduction, a number of experiments show that strongly driving the transmon leads to a decrease in T2. As numerous qubit manipulation schemes rely on the use of strong drives, it urges the need for understanding the sources of this decrease.

Here, we show that the band structure of the transmon is modified in the presence of the drives, yielding a global enhancement of the dephasing rate.

*This work was undertaken thanks in part to funding from NSERC, the Canada First Research Excellence Fund, and the Ministère de l'Économie et de l'Innovation du Québec, from the ARO grant No. W911NF-18-1-0411, and from the U.S. Department of Energy, Office of Science, National Quantum Information Science Research Centers, Quantum Systems Accelerator.

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Presenters

  • Joachim Cohen

    • Universite de Sherbrooke

Authors

  • Joachim Cohen

    • Universite de Sherbrooke

  • Alexandru Petrescu

    • Universite de Sherbrooke

  • Ross Shillito

    • Universite de Sherbrooke

  • Alexandre Blais

    • Universite de Sherbrooke
    • Institut quantique & Département de Physique, Université de Sherbrooke, Sherbrooke J1K2R1, Quebec, Canada