Two-qubit gates for the soft 0-{\pi} qubit

Abstract:The 0-{\pi} qubit promises longer lifetimes than the transmon, making it a strong candidate for a next-generation, lower-error qubit. Gyenis et al. experimentally demonstrated an unprotected single-qubit gate in the soft 0-{\pi} regime [1], but no corresponding two-qubit gate has yet been proposed. We propose an unprotected CZ gate for capacitively coupled soft 0-{\pi} qubits. The gate uses a direct transition between a computational state and a higher non-computational state. Assuming negligible device disorder and a phenomenological noise model, the simulated CZ gate achieves a fidelity of approximately 99.9% at a gate time of approximately 160 ns.

arXiv:2609.16630 [quant-ph]

(or arXiv:2609.16630v1 [quant-ph] for this version)

https://doi.org/10.48550/arXiv.2609.16630 Focus to learn more arXiv-issued DOI via DataCite (pending registration)

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