Degree of entanglement for two qubits

被引：71

作者：

Abouraddy, AF

Saleh, BEA

Sergienko, AV

Teich, MC

机构：

[1] Boston Univ, Dept Elect & Comp Engn, Quantum Imaging Lab, Boston, MA 02215 USA

[2] Boston Univ, Dept Phys, Quantum Imaging Lab, Boston, MA 02215 USA

来源：

PHYSICAL REVIEW A | 2001年 / 64卷 / 05期

关键词：

D O I：

10.1103/PhysRevA.64.050101

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We demonstrate that any pure bipartite state of two qubits may be decomposed into a super-position of a maximally entangled state and an orthogonal factorizable one. Although there are many such decompositions, the weights of the two superposed states are, remarkably, unique. We propose a measure of entanglement based on this decomposition. We also demonstrate that this measure is connected to three measures of entanglement previously set forth: maximal violation of Bell's inequality, concurrence, and two-particle visibility.

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页数：4

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