中文摘要：

研究了在真空辐射场作用下,两个V型三能级原子系统的纠缠随时间的演化特性.发现当两原子间距较远,自发辐射会导致纠缠退化,甚至导致纠缠突然死亡,而原子激发态衰变的速率会影响纠缠死亡的时间;当两原子间距非常小,由于原子间的合作效应,死亡后的纠缠会在一段时间后复苏,初始的纠缠和复苏的纠缠由不同的原因引起.

英文摘要：

We have studied the sudden death and revival of entanglement in two V-type three-level atoms coupled to the common vacuum.results show that in the case of largely separated atoms,spontaneous emission leads to decoherence and even causes entanglement sudden death.However,the excited-state decay rate of the atom can affect the time of entanglement sudden death.In the case of closely separated atoms,due to the collective effect of atoms,the entanglement which has been dead will revive in some time.The initial entanglement and the revival of entanglement arise from different causes.