考虑了动态 Stark 移位,通过计算双光子过程中压缩相干态的保真度,讨论了双光子 J-C 模型中能级的动 态 Stark 移位和光场的压缩因子 对量子态保真度的影响。研究表明:保真度的演化呈现明显的量子崩塌－复苏振荡。当考虑动态 Stark 移位时, 通过比较可以明显看出,在量子信息的处理和传递过程中,原子、场和系统的保真度明显好于不考虑动态 Stark 移位的情形。 初始场强调制了原子、场和系统保真度演化的量子崩塌复苏周期,使场保真度演化中的振荡脉冲变窄。同时,压缩因子 影响着体系中原子和场之间的能量交换。

By considering the dynamic Stark shift, the effects of dynamic Stark shift of level and the squeezed light field factors Y on the fidelity of quantum state are discussed. It is shown that the evolutions of the fidelity obviously exhibit the oscillations of quantum collapse and revival. Taking the Stark shift into consideration, a comparative study of the two processes for the fidelity is presented. The fidelities of the atom, the field and the system are higher than those in the absence of the dynamic Stark shift when manipulating and communicating quantum information. Meanwhile, the periodicities of the fidelity evolutions of atom, field and the system are modulated by the intensity of the initial light field, and the impulse of the oscillation of fidelity for the field become smaller. The energy between field and atom is influenced by the squeezed light field factors.