Suppression of Qubit Crosstalk in a Tunable Coupling Superconducting Circuit Device

ORAL

Abstract

On-demand qubit-qubit interactions without unwanted crosstalk are crucial for realization of a scalable quantum computer. We demonstrate a tunable coupler between two transmon qubits which is able to achieve zero static ZZ coupling strength due to interference effects, in agreement with our theoretical model. We are able to tune the ZZ coupling from +2MHz to -100kHz. We characterize the effect of the ZZ crosstalk on single qubit gate fidelity by simultaneous randomized benchmarking. Furthermore, by statically biasing at the low crosstalk point and selectively modulating the flux through the coupler, we implement an iSWAP gate between the two qubits.

–

Presenters

  • Pranav Mundada

    Electrical Engineering, Princeton University

Authors

  • Pranav Mundada

    Electrical Engineering, Princeton University

  • Gengyan Zhang

    Princeton University, Electrical Engineering, Princeton University

  • Andrew Houck

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