A COMPARATIVE STUDY OF NEGATIVITY AND CONCURRENCE BASED ON SPIN COHERENT STATES

被引：48

作者：

Berrada, K. ^{[1
]}

El Baz, M. ^{[1
]}

Eleuch, H. ^{[2
,3
]}

Hassouni, Y. ^{[1
]}

机构：

[1] Univ Mohammed V Agdal, Phys Theor Lab, Fac Sci, Rabat, Morocco

[2] Texas A&M Univ, Inst Quantum Studies, College Stn, TX 77843 USA

[3] Texas A&M Univ, Dept Phys, College Stn, TX 77843 USA

来源：

INTERNATIONAL JOURNAL OF MODERN PHYSICS C | 2010年 / 21卷 / 03期

关键词：

Quantum information; entanglement measures; spin coherent state; QUANTUM CRYPTOGRAPHY; ENTANGLEMENT; SEPARABILITY; PAIR;

D O I：

10.1142/S0129183110015129

中图分类号：

TP39 [计算机的应用];

学科分类号：

081203 ; 0835 ;

摘要：

In this paper, we investigate two different entanglement measures, the negativity and concurrence, in the case of pure and mixed states of two-qubit system basing on the spin coherent states. For two-qubit pure states, the negativity is the same as the concurrence. For mixed states, using a simplified expression of concurrence in Wootters' measure of entanglement, we write the bounds of Verstraete et al.(1) as a function of some new parameters and we compare the both measures for a class of mixed states.

引用

页码：291 / 305

页数：15

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