压缩态光场变耦合系数双光子J-C模型性质

讨论了初始光场为压缩态、原子-光场耦合系数随时间变化情形下双光子过程J-C模型的量子统计性质。具体研究了双光子过程中原子布居数反转、光场的压缩等随时间的演化性质，讨论了初始光场的压缩系数、压缩相位及耦合系数变化快慢对这些性质的影响。研究结果表明，初始光场的压缩系数增大，崩塌和回复的频率增大，回复值减小。当原子-光场耦合系数变化缓慢时，崩塌和回复现象被延迟。而光场逐渐失去压缩性质；而当耦合系数变化较快时，崩塌和回复现象被加速，而光场压缩量将产生振荡，压缩效应将反复出现。

The Time-Dependent Atom-Field Coupling J-C Model with an Initial Squeezing State: Two-Photon Process

The quantum statistical properties of two photon Jaynes Cummings model with a time dependent atom field coupling coefficient are discussed under the initial squeezing state of the light field. Especially, the time evolution of the atomic population inversion and the squeezing properties of the cavity field is investigated. The effects of the atom field coupling coefficient, the squeezing parameter and phase on these properties are also discussed. When the squeezing coefficient of the initial field increases, the frequency of collapse revival in atomic population inversion increases, and the amplitude of revival decreases. When the atom field coupling coefficient changes slowly, the collapse revival is delayed, and the squeezing of the field is lost gradually. When the coupling coefficient changes rapidly, it accelerates the collapse revival phenomena, and the squeezing parameter oscillates with time, the squeezing of the field appears repeatedly.