A tight bound on negativity of superpositions

被引：6

作者：

Ma, K. -H. ^{[1
]}

Yu, C. S. ^{[1
]}

Song, H. S. ^{[1
]}

机构：

[1] Dalian Univ Technol, Sch Phys & Optoelect Technol, Dalian 116024, Peoples R China

来源：

EUROPEAN PHYSICAL JOURNAL D | 2010年 / 59卷 / 02期

基金：

中国国家自然科学基金;

关键词：

ENTANGLEMENT; STATE;

D O I：

10.1140/epjd/e2010-00150-4

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

By a variational definition of the entanglement measure - negativity, we derive an upper bound of negativity of superpositions in terms of the negativities of the quantum states being superposed. It is shown that the upper bound has a simple formulation. In particular, in many cases the upper bound is tighter than the previous bounds.

引用

页码：317 / 320

页数：4

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