三能级运动原子与单模场相互作用系统中场(原子)熵的演化

The Evolution of Field(Atom) Entropy in the Interaction of a Three-level Moving Atom with Field

在共振和远离共振情况下,具体讨论了初始平均光子数、原子运动和场模结构参数对三能级运动原子与单模场相互作用系统中场(原子)熵演化的影响。结果显示原子运动导致场熵演化具有周期性,这种周期性并不依赖场的统计分布和强度而是依赖于原子运动和场模结构参数εp。不论是共振情况还是远离共振情况,在选取合适的参数εp(这种选取在实验上是可能的)时,我们都能得到较长时间的纯态光场。

Under on-resonance condition and far-off-resonance condition, at first, we used the full quantum theory to educe the wave function of the system. Secondly, we utilized entropy theory, in virtue of the wave function, to discuss the effects of the initial mean photon number, the atomic motion and the field-mode structure on the evolution of the field （atom） entropy at length in the interaction of a three-level moving atom with field. The results show that the atomic motion leads to the periodic evolution of the field entropy, this periodicity does not depend on the statistical distribution and the intensity of the initial field mode, but depend on the atomic motion and the field-mode structure parameters εp. Both on-resonance condition and far-off-resonance condition, when making a suitable choice for parameter ep （this choice is experimentally possible）, we can get pure field state for a long time.