关于两体量子态纠缠目击的一些注记

摘要

在回顾总结两体量子态纠缠目击已有结论的基础上,对两体量子态纠缠目击的一些定理进行了进一步的探讨.基于自伴算子的一种分解,给出了纠缠目击的一个刻画,证明了纠缠目击的一系列性质,并举例说明了两体量子态最优纠缠目击的判定.最后,给出了最优纠缠目击的若干性质,提出了最优不可分解纠缠目击的一种判定方法.%Based on the existing conclusions on entanglement witness of bipartite states, entanglement witnesses of bipartite quantum states are further discussed. Firstly,in light of a decomposition of a self-adjoint operator,characterization of an entanglement witness is given,and some properties of entanglement witnesses are proved. An example is taken to illustrate the judgment of optimal entanglement witness. Finally,the optimal entanglement witnesses are discussed and a judgment of optimal indecomposable entanglement witness is presented.