Stark效应对量子纠缠信息交换传递的影响

Influence of the Stark Effect on Transfer of Quantum Entangled Information

用多个"二能级原子与单模光场"组成的联合物理模型,考虑Stark效应后,推导了该系统的态矢演化式,得到光场纠缠度的数值计算结果.讨论了Stark效应和初始场强对量子纠缠信息交换传递的影响.结果发现,在一定条件下,原子纠缠态与光场纠缠态之间可以转化,实现了量子纠缠信息的交换传递,且Stark效应和初始场强对此过程有着显著的影响:光场的纠缠程度随着初始场强的增强而增大;在强场条件下,光场纠缠度出现崩塌-回复现象.Stark移位参量越大,光场纠缠度振荡越剧烈,说明Stark效应破坏了光场纠缠程度的稳定性.

Using the joint physical model consisted of many two-level atoms and single-mode light fields, the evolution of the system state voter and the numerical results of the entanglement degree for the entangled light field in the presence of Stark effect are presented. The influence of the Stark effect and intensity of the initial fields on transfer of quantum entangled information are studied. It is found that quantum entanglement information can be transferred between the cavity fields and atoms under the certain conditions in order to realize transfer of quantum entangled information. The effects of Stark shift and intensity in the initial fields on the process are obvious. The entangled degree of light field increases with intensity of the initial field increase. The collapses and revivals of entangled degree appears when the initial fields are strong. The greater the stark shift parameter is, the faster the oscillation of the entangled degree of light fields will be. This shows that the Stark effect destroys the steady properties of entangled degree of light fields.