Bell态原子与双模纠缠相干光场相互作用的场熵演化特性

运用全量子理论研究了初始处于Bell态(对称迭加态或反对称态)的两原子与双模纠缠相干光场相互作用系统中场熵的演化特性. 分析了光场强度、光场纠缠度及原子间相互作用强度对场熵演化特性的影响. 结果表明：原子初态处于反对称态时，场熵始终为零；原子初态处在对称迭加态时，增大光场强度场熵的时间演化曲线逐渐变成较规则的振荡曲线，原子间的相互作用强度对双原子间纠缠度有显著的非线性调制作用.

Entropy properties in the system of atoms in Bell states interacting with the two-mode entangled coherent field

The field entropy time evolution in Bell states (the symmetry superposition state and the antisymmetric superposition state) interacting with the two-mode entangled coherent field is investigated by means of full quantum theory. The effects of the atoms initial state, mean photon numbers of field, the degree of the entanglement for the entangled coherent fields, and the coupling strength of interaction between atoms on the entropy evolution properties of the field are discussed. The results shows that the entropy will forever be zero when the initial state is in the antisymmetric superposition state. For the state the symmetry superposition state, the oscillation of the field entropy presents periodicity with the increasing of the mean photon number. And the coupling strength of interaction between atoms plays a major role in the entropy evolution properties.