耦合系数随时间变化的V-型三能级原子与单模场相互作用系统中熵的演化

在共振情况下,且原子-场耦合系数随时间线形变化时,研究了V-型三能级原子与单模场相互作用系统中熵的演化特性,分析了耦合系数变化的快慢和不同的初始光场对场(原子)熵的影响.结果表明:初始光场的统计性质的不同将导致系统的场(原子)熵演化发生很大的变化.当原子-场耦合系数变化缓慢时,原子进入统计混合态的速度被减缓;而当原子-场耦合系数变化较快时,则使场熵演化曲线的振荡频率加快.

Evolution of entropy in the interaction of a V-type three-level atom and single-model field with a time-dependent atom-field coupling

Under on-resonance condition and with a time-dependent atom-field coupling, we study the entropy properties of the field interacting with a V-type three-level atom,and discuss the effects of the atom-field coupling coefficient and the different initial field on the field (atom) entropy at length. The results show that the different statistical properties of the initial field will lead to the change of the field (atom) entropy. When the atom-field coupling coefficient changes slowly, the speed of atom entering the statistical state is slowed; When the atom-field coupling coefficient changes rapidly, the oscillating frequency of the evolution of entropy speed up.