Fast crosstalk-free perfect entangler in a tunable coupling superconducting circuit

ORAL

Abstract

On-demand strong qubit-qubit interactions are crucial for the realization of a scalable quantum computer. Currently, the performance of high coherence transmons is limited by unwanted cross-Kerr or "ZZ" crosstalk. Using interference between two couplers has been previously shown to mitigate ZZ crosstalk. Here, we provide a novel tunable coupler design that harnesses interference due to the higher energy levels to achieve zero static ZZ coupling between the two qubits. Biasing to zero ZZ interaction, we realize a fast perfect entangler with parametric flux modulation and investigate the gate fidelity using randomized benchmarking.

*This work was undertaken thanks in part to funding from ARO HIPS (W911NF1910016), NSF EPIQC (CCF-1730082), NSERC, the Canada First Research Excellence Fund, and the ARO grant No. W911NF-18-1-0411.

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Presenters

  • Pranav Mundada

    • Princeton University
    • Q-CTRL
    • Department of Electrical Engineering, Princeton University

Authors

  • Pranav Mundada

    • Princeton University
    • Q-CTRL
    • Department of Electrical Engineering, Princeton University

  • Andrei Vrajitoarea

    • Princeton University
    • University of Chicago

  • Alexander Place

    • Princeton University

  • Agustin Di Paolo

    • Physics, Universite de Sherbrooke
    • Universite de Sherbrooke
    • Département de Physique, Université de Sherbrooke
    • Institut quantique & Departement de Physique, Universite de Sherbrooke

  • Camille Le Calonnec

    • Universite de Sherbrooke

  • Alexandru Petrescu

    • Universite de Sherbrooke
    • Université de Sherbrook

  • Catherine Leroux

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

  • Alexandre Blais

    • Universite de Sherbrooke
    • Institut Quantique and Département de Physique, Université de Sherbrooke
    • Physics, Universite de Sherbrooke
    • Université de Sherbrook
    • Université de Sherbrooke
    • Département de Physique, Université de Sherbrooke
    • Institut quantique & Departement de Physique, Universite de Sherbrooke
    • Institut quantique and Departement de physique, Universite de Sherbrooke
    • Institut Quantique and Department de Physique, Universite de Sherbrooke
    • Institut quantique and Departement de Physique, Universite de Sherbrooke

  • Andrew Houck

    • Princeton University
    • Department of Electrical Engineering, Princeton University