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We implement an iSWAP gate with two transmon qubits using a flux-tunablecoupler. Precise control of the relative phase of the qubit-control pulses andthe parametric-coupler drive is achieved with a multi-channel instrument calledPresto using direct digital synthesis (DDS), a promising technique for scalingup quantum systems. We describe the process of tuning and benchmarking theiSWAP gate, where the relative phase of the pulses is controlled via software.We perform the iSWAP gate in 290 ns, validate it with quantum-state tomography,and measure 2\% error with interleaved randomized benchmarking.

Characterization and benchmarking of a phase-sensitive two-qubit gate using direct digital synthesis