双模纠缠相干光场与Bell态原子相互作用系统的原子偶极压缩效应

Dipole squeezing in the system of the two-mode entangled coherent field interacting with atoms in Bell states

运用解Schrdinger方程和数值计算方法,研究了处于Bell态的两个全同二能级纠缠原子与双模纠缠相干光场相互作用系统的原子偶极压缩特性。分析了原子体系的初态、双模纠缠相干光场的纠缠程度、初始光场的平均光子数以及两纠缠原子的相互作用强度对偶极压缩性质的影响。结果表明：若初始时刻原子处在Bell态|β_(000)〉、|β_(01)〉和β_(11)〉时,不会出现偶极压缩效应。而处在Bell态|β_(10)〉时在一定条件下可呈现原子偶极压缩效应,且偶极压缩效应与初始光场的平均光子数和双模纠缠相干光场的纠缠程度有关。

The atomic dipole squeezing effects in the system of two identical two-level atoms in the Bell state interacting with the two-mode entangled coherent states field are investigated by means of SchrSdinger equation solution and numerical calculations. The effects of the atomic initial state, mean photon numbers of field, the degree of the entanglment for the entangled coherent fields, and the coupling strength of dipole-dipole interaction between atoms on the atomic dipole squeezing effects are discussed. The results show that dipole squeezing effect does not appear for the Bell state ｜β00〉, ｜β01〉 and ｜β11〉, however there can appear the dipole squeezing effects under some conditions for the Bell state ｜β10〉. In the case, the dipole squeezing effect not only depends on the mean photon numbers but also on the degree of entanglement of the two-mode entangled coherent field.