Constructing optimal entanglement witnesses. II. Witnessing entanglement in 4N x 4N systems

被引：32

作者：

Chruscinski, Dariusz ^{[1
]}

Pytel, Justyna ^{[1
]}

机构：

[1] Nicholas Copernicus Univ, Inst Phys, PL-87100 Torun, Poland

来源：

PHYSICAL REVIEW A | 2010年 / 82卷 / 05期

关键词：

SEPARABILITY; STATES;

D O I：

10.1103/PhysRevA.82.052310

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We provide a class of optimal nondecomposable entanglement witnesses for 4N x 4N composite quantum systems or, equivalently, another construction of nondecomposable positive maps in the algebra of 4N x 4N complex matrices. This construction provides natural generalization of the Robertson map. It is shown that their structural physical approximations give rise to entanglement breaking channels.

引用

页数：5

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