Upper bound on singlet fraction of two-qubit mixed entangled states

被引：2

作者：

Adhikari, Satyabrata ^{[1
]}

Kumar, Atul ^{[2
]}

机构：

[1] Birla Inst Technol, Ranchi 835215, Bihar, India

[2] Indian Inst Technol Jodhpur, Jodhpur 342011, Rajasthan, India

来源：

QUANTUM INFORMATION PROCESSING | 2016年 / 15卷 / 07期

关键词：

QUANTUM; MATRIX;

D O I：

10.1007/s11128-016-1295-y

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We demonstrate a new method to achieve the maximum singlet fraction using an entangled mixed two-qubit state as a resource. For this, we establish a tight upper bound on singlet fraction and show that the maximal singlet fraction obtained in Verstraete and Verschelde (Phys Rev Lett 90:097901(1)-097901(4), 2003) does not attain the upper bound on the singlet fraction derived here. Interestingly, we found that the required upper bound can, in fact, be achieved using local filtering operations.

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收藏

页码：2797 / 2803

页数：7

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