Closed form of local quantum uncertainty and a sudden change of quantum correlations
Closed form of local quantum uncertainty and a sudden change of quantum correlations
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发表时间：
2013-07
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通讯作者：
Shuhao Wang;Hui Li;Xian Lu;G. Long
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作者：
Shuhao Wang;Hui Li;Xian Lu;G. Long
量子关联在量子信息处理任务中的量子特性中起着至关重要的作用，对研究量子现象具有重要意义。在量子关联的度量中，最近提出了二分量子系统的局域量子不确定度(LQU)。莱特牧师。110、240402(2013年)]。在本文中，我们导出了一大类任意维二体量子态的LQU的闭合形式。我们回顾了在从可分离到束缚和自由纠缠态的转变过程中量子关联的突然变化的问题。莱特牧师。82,1056(1999)]。通过使用LQU，我们证明了这种突变恰好位于从可分离纠缠态到束缚纠缠态的过渡点附近。
Quantum correlations play vital roles in the quantum features in quantum information processing tasks, and it is of fundamental importance in studying quantum phenomenons. Among the measures of quantum correlations, recently, the local quantum uncertainty (LQU) for bipartite quantum systems is proposed [Phys. Rev. Lett. 110, 240402 (2013)]. In this paper, we have derived the closed form of the LQU for a large class of arbitrary-dimensional bipartite quantum states. We revisit the problem of sudden change of quantum correlations in the transition from separable to bound and free entangled states [Phys. Rev. Lett. 82, 1056 (1999)]. By using the LQU, we have demonstrated that the sudden change located exactly near the transition point from separable to bound entangled states.