利用全量子理论,对NCS场态与多光子跃迁二能级原子相互作用系统的量子纠缠特性进行了探究。分析了数态光子数、热平均光子数、跃迁光子数、原子初态等参量对系统量子纠缠特性的影响。结果表明:跃迁光子数越大,系统纠缠现象出现的时域越大,但是跃迁光子数的增大会破坏系统的平均纠缠度;原子初态参量对系统的纠缠度有明显的影响,原子趋于基态和激发态的系统纠缠程度是不同的,但对平均纠缠度的影响几乎相同;数态光子数越大或热平均光子数越小,系统纠缠现象出现的时域越小。

The quantum entanglement characteristics of a system composed of a multi-photon transition two-level atom interacting with the number-chaotic state was studied on the full quantum theory. The effect of the photon number of the number state,the average photon number of the chaotic state,the values of the transitional photon number,and the atomic initial state were analyzed in this paper.The results showed that,with the increasing of the values of the transitional photon number,the range of the entanglement phenomenon in the system increases obviously and the average entanglement degree of the system decreases.The atomic initial state affects the entanglement degree of the system obviously. Although the mixedness degree of the atomic initial state tending the ground state and to the excited state are identical,the effects on the entanglement degree of system are different,but it has almost the same effect on the average degree of entanglement. The range of the entanglement phenomenon in the system is smaller,with the greater of the photon number of the number state,or the smaller of the average photon number of the chaotic state.