Amplification of optical Schr\"{o}dinger cat states with implementation protocol based on frequency comb

• URL: http://arxiv.org/abs/2112.13791v2
• Date: Tue, 4 Jan 2022 11:05:07 GMT
• Title: Amplification of optical Schr\"{o}dinger cat states with implementation protocol based on frequency comb
• Authors: Hongbin Song, Guofeng Zhang, Xiaoqiang Wang, Hidehiro Yonezawa, Kaiquan Fan
• Abstract summary: We propose a scheme to generate large-size Schr"odinger cat states based on linear operations of Fock states and squeezed vacuum states. A feasible configuration based on a quantum frequency comb is developed to realize the large-size cat state generation scheme.
• Score: 4.0393170834193235
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: We proposed and analyzed a scheme to generate large-size Schr\"{o}dinger cat states based on linear operations of Fock states and squeezed vacuum states and conditional measurements. By conducting conditional measurements via photon number detectors, two unbalanced Schr\"{o}dinger kitten states combined by a beam splitter can be amplified to a large-size cat state with the same parity. According to simulation results, two Schr\"{o}dinger odd kitten states of $\beta=1.06$ and $\beta=1.11$ generated from one-photon-subtracted squeezed vacuum states of $-$3 dB, are amplified to an odd cat state of $\beta=1.73$ with a fidelity of $F=99\%$. A large-size Schr\"{o}dinger odd cat state with $\beta=2.51$ and $F=97.30\%$ is predicted when the input squeezed vacuum states are increased to $-$5.91 dB. According to the analysis on the impacts of experimental imperfections in practice, Schr\"{o}dinger odd cat states of $\beta>2$ are available. A feasible configuration based on a quantum frequency comb is developed to realize the large-size cat state generation scheme we proposed.

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