Concurrence,tangle and fully entangled fraction

作     者：李明 费少明 李先清 

作者机构：College of Mathematics and Computational ScienceChina University of Petroleum Department of MathematicsCapital Normal University Max-Planck-Institute for Mathematics in the Sciences 

出 版 物：《Chinese Physics B》 (中国物理B（英文版）)

年 卷 期：2010年第19卷第9期

页      面：161-167页

核心收录：

学科分类：0809[工学-电子科学与技术（可授工学、理学学位）] 07[理学] 070205[理学-凝聚态物理] 08[工学] 0702[理学-物理学] 

基　　金：supported by the National Natural Science Foundation of China (Grant Nos.10774088,10675086,10875081,and 10871227) the National Basic Research Program of China(Grant No.2004CB318000) 

主　　题：concurrence entanglement teleportation 

摘      要：We show that although we cannot distil a singlet frora many pairs of bound entangled states, the concurrence and the tangle of two entangled quantum states are always strictly larger than those of one of them, even both entangled quantum states are bound entangled. We present a relation between the concurrence and the fidelity of optimal teleportation. We also give new upper and lower bounds for concurrence and tangle.