摘要
The time evolution of system in two photon Jaynes Cummings (J C) model without rotating waves approximation (RWA) is obtained by using the theory of ordinary differential equations. Based on the evolution, the mean value of the atom inversion operator 〈 S 3(t)〉 is gi ven. The influence of the “counter rotating term” on the collapse and revival phenomenon is discussed from the comparison between the cases with RWA and without RWA. It shows that the influence of the virtual photon field makes the quantum fluctuations appear on the collapse and revival phenomenon.
采用常微分方程理论研究了无旋波近似下双光子Ｊ－Ｃ模型系统的时间演化。在此基础上，给出了原子反转算符的平均值。通过旋波近似和无旋波近似的比较，讨论了旋波项对衰变和回复现象的影响。说明了虚光场的影响可使得在衰变和回复现象中出现量子噪声。
