High-speed $R_{ZZ}$ gates in Kerr-cat qubits via fast-forward scaling

Abstract:Kerr parametric oscillators can encode Kerr-cat qubits, whose biased-noise nature can reduce the hardware overhead required for fault-tolerant quantum computation. In a recently proposed $R_{ZZ}$-gate scheme for Kerr-cat qubits, a tunable coupler must be displaced while avoiding nonadiabatic excitation. To address this challenge, we propose and theoretically analyze a protocol that applies fast-forward scaling to the coupler displacement. The protocol suppresses nonadiabatic excitation of the coupler and enables high speed $R_{ZZ}$ gates.

arXiv:2511.11056 [quant-ph]

(or arXiv:2511.11056v3 [quant-ph] for this version)

https://doi.org/10.48550/arXiv.2511.11056 Focus to learn more arXiv-issued DOI via DataCite

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