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中文摘要：
电路量子电动力学的实验实现了光与人造原子的超强耦合相互作用，相互作用强度与光场频率在同一个数量级．在超强耦合区域，著名的旋波近似失效，因此系统的动力学必须用含有反旋波项的Rabi模型描述．本文研究Rabi模型中的光场压缩．数值模拟结果发现，光场压缩不是随耦合强度线性增加，而是在合适的超强区域获得最大值．同时，我们还发现，较小的反旋波项有助于提高光场压缩．所得结果有利于实验上在超强区域中制备所需的压缩态．
英文摘要：
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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