摘要
我们学习任意的混合状态的充分纠缠的部分(FEF ) 。FEF 的新上面的界限被导出。这些上面的界限在 FEF 的价值的评价上做补充。为微弱地混合的量状态，上面的界限被显示对 FEF 的准确价值很紧张。
We study the fully entangled fraction （FEF） of arbitrary mixed states. New upper bounds of FEF are derived. These upper bounds make complements on the estimation of the value of FEF. For weakly mixed quantum states, an upper bound is shown to be very tight to the exact value of FEF.
基金
Supported by the Natural Science Foundation of China under Grant No. 10875081
Key Project of Beijing Education Commission under Grant No. KZ200810028013
