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Abstract

Recent experiments about the circuit cavity quantum electrodynamics have realized the ultrastrong couplings between the artificial atom and the photon, in which the coupling strengths have the same order of the photon frequency. In such a regime, the well-known rotating wave approximation is invalid, and the system dynamics is thus governed by the Rabi model. In this paper, we investigate the photon squeezing of the Rabi model. We find numerically that with the increase of the atom-photon coupling strength, the photon squeezing does not increase linearly, but displays a maximum in the ultrastrong coupling regime. In addition, we also reveal that the photonsqueezing can be enhanced by the counter-rotating terms of the Rabi model. Our results are of benefit to preparing the required squeezing state of the photon in experiment.

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Funds:Project supported by the National Natural Science Foundation of China (Grant Nos. 11074184, 11275129, 61275211) and the Natural Science Foundation of Zhejiang Province, China (Grant No. LY13A040001).

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Vol. 62, Issue 16 - 2013-08-20

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