利用全量子理论,研究了多光子跃迁下NCS(the number-chaotic state)态光场与运动二能级原子相互作用系统的保真度。讨论了原子的初始状态、数态光子数、热平均光子数、跃迁光子数、场模结构参数对系统保真度的影响。结果表明:场模结构参数影响系统量子态的振荡周期;热平均光子数影响系统保真度大小;原子初始状态、数态光子数及跃迁光子数选取不同,系统量子态的保真度表现出不同的规律。

The fidelity for the quantum state of a moving two-level atom interacting with a number-chaotic state (NCS) light via a multi-photon transition is studied on the full quantum theory. The influence of atomic initial state and the parameters, including field-mode structure parameter, the average photon number of the chaotic state and the photon number of the number state etc., on the fidelity of the system is analyzed. The results show that the field-mode structure parameter affects the oscillation period of the fidelity and the average photon number of the chaotic state is correlated with value of the fidelity. For some values of atomic initial state, the photon number of the number state and transitional photon number, the fidelity evolution present different patterns.