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
收藏
页码：317 / 320
页数：4
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