P. S. Mundada, G. Zhang, T. Hazard, and A. A. Houck, “
Suppression of Qubit Crosstalk in a Tunable Coupling Superconducting Circuit,”
Physics Review Applied, vol. 12, pp. 054023, 2018.
Publisher's VersionAbstractWe report the suppression of static ZZ crosstalk in a two-qubit, two-coupler superconducting circuit, where the ZZ interaction between the two qubits can be tuned to near zero. Characterization of qubit crosstalk is performed using randomized benchmarking and a two-qubit iSWAP gate is implemented using parametric modulation. We observe the dependence of single-qubit gate fidelity on ZZ interaction strength and identify effective thermalization of the tunable coupler as a crucial prerequisite for high fidelity two-qubit gates.