四原子Tavis-Cummings模型中两体及多体纠缠的研究

A Study on Pair-wise and Multipartite Entanglement Dynamics of Four-atom Tavis-Cummings Model

首先,研究4个二能级原子与1个单模腔场相互作用下量子系统的演化情况,在此基础上,再运用concurrence和tangle两种度量对4个二能级原子之间及与腔场的相互纠缠的周期性演化进行计算并对其结果进行讨论和分析。通过比较两种度量之间的关系发现此量子系统只存在两体纠缠,而不存在多体之间的纠缠,另外,在恰当选择时间的情况下,可以产生四原子相互作用下的W态。

The entanglement dynamics of four two-level atoms within a single-mode cavity using concurrence and tangle is discussed.The concurrence and tangle of the system are periodic functions of time.The results show that the entanglement of the present system is restricted to the class of pair-wise entanglement.In addi-tion,the four-qubit W state could be generated in the present model if the interaction time of the atoms and the cavity is chosen appropriately.