Kerr介质中V型三能级原子与双模奇偶纠缠相干光场相互作用的纠缠特性

Entanglement in the system of a V-type three-level atom interacting with the two-mode odd-even entangled coherent field in Kerr medium

运用量子约化熵研究了Kerr介质中V型三能级原子与双模奇偶纠缠相干光场相互作用系统中场熵的演化特性.分析了Kerr介质、失谐量和光场的初始平均光子数对场熵的影响.结果表明:Kerr介质与光场的耦合系数对场熵的振荡特性有调制作用,增大失谐量,场熵的最大值减小,振荡频率增大,由初始时刻的零值增大到最大值所需的时间也增大;光场的平均光子数太大或太小都不利于原子与光场之间的纠缠.

The quantum reduced entropy properties of a V-type three-level atom interacting with the two-mode odd-even entangled coherent field in Kerr medium are studied by means of quantum theory. The effects of the Kerr medium＇s coupling constant, the detuning, mean photon numbers of the fields on the entropy are discussed. The results show that the coupling strength of Kerr medium with the field influences the frequency of the entropy. The maximum values of entropy evolution decreases with the increasing of the detuning, meanwhile the frequencies increase, and the needed time to get the maximum value from the initial value zero is longer. When the mean photon numbers are too less or too more, the maximum values of entropy oscillation are much smaller.