The Schr\"odinger cat (SC) states are important in quantum optics because of their non-Gaussian properties. We propose a novel method of conditional generation of bright (multi-photon) SC states that uses degenerate parametric down-conversion and heralding measurement of the photon number in the pump mode. We show that this method, in principle, could be implemented using the modern high-Q optical microresonators.
@article{arxiv.2407.05759,
title = {Preparation of Schr\"odinger cat quantum state using parametric down-conversion interaction},
author = {V. L. Gorshenin},
journal= {arXiv preprint arXiv:2407.05759},
year = {2025}
}