Entanglement magnification induced by local manipulations
Entanglement magnification induced by local manipulations
复制标题
局部操作引起的纠缠放大
DOI：
10.1103/physreva.76.042315
复制
发表时间：
2007
影响因子：
2.9
通讯作者：
R. Romano
中科院分区：
文献类型：
--
作者：
R. Romano
研究了当动力学参数固定时，即在时间演化过程中不能通过外部控制来改变时，一对量子比特在幺正动力学下演化的纠缠能力.与快速本地控制制度，我们发现，本地和非本地的动态贡献是严格相互关联的，都在确定纠缠能力的通道相关。事实证明，通过适当地初始化双方的特征能量，可以大大增加这个量;当这些能量相等时，可以获得有意义的放大。得到的一个子类的动力学的分析结果，和数值结果更一般的情况下。
We study the entanglement capability of the evolution of a pair of qubits subject to unitary dynamics, when the dynamical parameters are fixed, that is they cannot be modified during the time evolution via external control. Unlike the fast local control regime, we find that local and nonlocal contributions to the dynamics are strictly interconnected, and both relevant in determining the entangling capability of the channel. It turns out that it is possible to strongly increase this quantity by suitably initializing the characteristic energies of the two parties; a significative magnification is obtained when these energies are equal. Analytical results are obtained for a subclass of dynamics, and numerical results are presented for more general cases.