A useful strong lower bound on two-qubit concurrence

被引：6
|
作者：
Jafarpour, Mojtaba [1 ]
Sabour, Abbass [1 ]
机构：
[1] Shahid Chamran Univ, Dept Phys, Ahvaz, Iran
来源：
QUANTUM INFORMATION PROCESSING | 2012年 / 11卷 / 06期
关键词：
Entanglement; Concurrence; Lower bound; Localizable entanglement; QUANTUM CRYPTOGRAPHY; ENTANGLEMENT; STATE;
D O I：
10.1007/s11128-011-0288-0
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
A new strong lower bound on concurrence for two-qubit states is derived. Its equality with the concurrence itself for the pure- and X-states is proved analytically; while extensive numerical computations show that equality for a general mixed state may also exist. Being a very simple function and easy to calculate, it is more convenient and practical than the exact value in some cases, including entanglement investigations in spin chains. We study thermal localizable entanglement in spin chains as an example, to demonstrate the convenience of this bound.
引用
收藏
页码：1389 / 1402
页数：14
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