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Large-amplitude squeezed cat and high-quality Gottesman-Kitaev-Preskill (GKP)states are powerful resources for quantum error correction. However, previousschemes in optics are limited to low success probabilities, small amplitudes,and low squeezing. We overcome these limitations and present scalable schemesin optics for the deterministic preparation of large-amplitude squeezed catstates using only Gaussian operations and photon-number measurements. Thesestates can be bred to prepare high-quality approximate GKP states, showing thatGKP error correction in optics is technically feasible in near-termexperiments.

Deterministic preparation of optical squeezed cat and Gottesman-Kitaev-Preskill states