Related papers: Generation of optical Schr\"{o}dinger's cat states by generalized photon subtraction

Generation of optical Schr\"{o}dinger's cat states by generalized photon subtraction

URL: http://arxiv.org/abs/2009.08580v1
Date: Fri, 18 Sep 2020 01:19:57 GMT
Title: Generation of optical Schr\"{o}dinger's cat states by generalized photon subtraction
Authors: Kan Takase, Jun-ichi Yoshikawa, Warit Asavanant, Mamoru Endo, and Akira Furusawa
Abstract summary: We propose a high-rate generation method of optical Schr"odinger's cat states. Our method relaxes the constraints on experimental parameters, allowing us to optimize them and attain a high generation rate.
Score: 0.0
License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Abstract: We propose a high-rate generation method of optical Schr\"{o}dinger's cat states. Thus far, photon subtraction from squeezed vacuum states has been a standard method in cat-state generation, but its constraints on experimental parameters limit the generation rate. In this paper, we consider the state generation by photon number measurement in one mode of arbitrary two-mode Gaussian states, which is a generalization of conventional photon subtraction, and derive the conditions to generate high-fidelity and large-amplitude cat states. Our method relaxes the constraints on experimental parameters, allowing us to optimize them and attain a high generation rate. Supposing realistic experimental conditions, the generation rate of cat states with large amplitudes ($|\alpha| \ge 2)$ can exceed megacounts per second, about $10^3$ to $10^6$ times better than typical rates of conventional photon subtraction. This rate would be improved further by the progress of related technologies. Ability to generate non-Gaussian states at a high rate is important in quantum computing using optical continuous variables, where scalable computing platforms have been demonstrated but preparation of non-Gaussian states of light remains as a challenging task. Our proposal reduces the difficulty of the state preparation and open a way for practical applications in quantum optics.

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