双J-C模型中两原子的纠缠动力学特征

Two-atom Entanglement Evolution Characteristics in Double Jaynes-Cummings Model

初始处于类贝尔纠缠态的完全一样的二能级原子A和B分别与空间分离的两处于真空场的腔场a和腔场b发生相互作用,利用双Jaynes-Cummings理论模型进行分析,我们采用部分转置矩阵的负本征值(negativity)的方法研究了两原子间纠缠度随时间演化的动力学特征,通过数值计算和理论分析发现在一定参数范围内原子间出现纠缠猝死现象;通过参数调整能有效缩小纠缠猝死区域,在一定的参数条件下能有效消除两原子间的纠缠猝死现象。

The entangled two-atom system interacts with two seperate cavities in vacuum field.Using the partially transposed matrix of negative eigenvalues(negativity) method we analysis the two-atom entanglement characteristics in a vacuum field and find that the entanglement of two atoms periodically oscillates in vacuum field and we obtain that the phenomenon of entanglement sudden death appeared in vacuum field.When the parameter changed,the regions of disentanglement reduces,and under certain conditions the phenomenon of entanglement sudden death disappeares.