量子关联与原子间相互作用距离关系的研究

本文将两个二能级原子注入一个腔中，用共生纠缠的方法来度量两原子之间的纠缠并推出它们之间的量子失协，还给出了原子与环境之间的共生纠缠与量子失协的计算公式，讨论了原子自发衰变率的变化对量子纠缠及失协的影响，及不同的初始状态情况下，纠缠及失协随原子距离的演化情况。结果表明：原子自发衰变率减小，原子与环境之间的量子纠缠及失协增加；选择不同的初态，可以控制原子间出现纠缠死亡的现象或量子失协为零的状态。

The research on the relationships between Quantum correlation and interatomic distance

In this paper, we pour two two-level atoms into a cavity. We measure the entanglement between the two atoms by using the method of concurrence and introduce the quantum discord between them. And we give computational formula of concurrence entanglement, quantum discord between the atom and the environment. Also discuss the influence of the atom spontaneous decay rate to the entanglement and the quantum discord. The evolution of the entanglement and quantum discord with the atomic distance with the different initial states. The results show that the entanglement and quantum discord between the atom and the environment all increase with the decreasing of the atomic spontaneous decay rate; In addition, the phenomenon of entanglement sudden death or quantum discord is zero can be controlled by choosing different initial state.