Entanglement measures and purification procedures

被引:1164
作者
Vedral, V [1 ]
Plenio, MB [1 ]
机构
[1] Univ London Imperial Coll Sci Technol & Med, Blackett Lab, Opt Sect, London SW7 2BZ, England
来源
PHYSICAL REVIEW A | 1998年 / 57卷 / 03期
关键词
D O I
10.1103/PhysRevA.57.1619
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
We improve previously proposed conditions each measure of entanglement has to satisfy. We present a class of entanglement measures that satisfy these conditions and show that the quantum relative entropy and Bures metric generate two measures of this class. We calculate the measures of entanglement for a number of mixed two spin-1/2 systems using the quantum relative entropy, and provide an efficient numerical method to obtain the measures of entanglement in this case. In addition, we prove a number of properties of our entanglement measure that have important physical implications. We briefly explain the statistical basis of our measure of entanglement in the case of the quantum relative entropy. We then argue that our entanglement measure determines an upper bound to the number of singlets that can be obtained by any purification procedure.[S1050-2947(98)03202-8].
引用
收藏
页码:1619 / 1633
页数:15
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