Entangling operations are at the heart of all approaches to quantum information processing. Parametric gates, in particular, offer a versatile solution to strongly couple off-resonant superconducting qubits with suppressed parasitic crosstalk to spectator qubits due to frequency-selective activation. In this work, we demonstrate a parametric iSWAP gate between two transmon qubits using the recently developed double transmon coupler (DTC). The DTC supports robust internally-defined cancellation point (``off'' state) for static interactions, while simultaneously mediating a fast parametric coupling between data qubits that can be deployed for high-fidelity two-qubit operations. We use robust phase estimation to calibrate non-commuting error terms in the parametric iSWAP gate, and achieve a 99.827% gate fidelity in 40ns without any numerical optimization. The circuit architecture and calibration techniques developed here are extensible to other gate implementations and qubit modalities, paving the way towards resource-efficient quantum information processing.
@article{arxiv.2604.27080,
title = {High-fidelity iSWAP gate with Double Transmon Coupler},
author = {Tarush Tiwari and Sudhir K. Sahu and Guilhem Ribeill and Michael Senatore and Matthew D. LaHaye and Raymond W. Simmonds and Daniel L. Campbell and Archana Kamal and Leonardo Ranzani},
journal= {arXiv preprint arXiv:2604.27080},
year = {2026}
}