Concurrence,tangle and fully entangled fraction  

作　　者：李明 费少明 李先清 

机构地区：[1]College of Mathematics and Computational Science,China University of Petroleum [2]Department of Mathematics,Capital Normal University [3]Max-Planck-Institute for Mathematics in the Sciences

出　　处：《Chinese Physics B》2010年第9期161-167,共7页中国物理B（英文版）

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)

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.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.

关 键 词：CONCURRENCE ENTANGLEMENT TELEPORTATION 

分 类 号：O413.1[理学—理论物理]