A double transmon coupler enables a parametric iSWAP gate with 99.827% fidelity in 40 ns between transmon qubits.
Koshino, Galvanically connected tunable coupler be- tween a cavity and a waveguide, New Journal of Physics 27, 043001 (2025)
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High-fidelity iSWAP gate with Double Transmon Coupler
A double transmon coupler enables a parametric iSWAP gate with 99.827% fidelity in 40 ns between transmon qubits.