A new coherence measure based on fidelity

被引：37

作者：

Liu, C. L. ^{[1
]}

Zhang, Da-Jian ^{[1
,2
]}

Yu, Xiao-Dong ^{[1
]}

Ding, Qi-Ming ^{[1
]}

Liu, Longjiang ^{[3
]}

机构：

[1] Shandong Univ, Dept Phys, Jinan 250100, Shandong, Peoples R China

[2] Shandong Normal Univ, Sch Phys & Elect, Jinan 250014, Shandong, Peoples R China

[3] Henan Univ Technol, Coll Sci, Zhengzhou 450001, Henan, Peoples R China

来源：

QUANTUM INFORMATION PROCESSING | 2017年 / 16卷 / 08期

基金：

中国国家自然科学基金; 中国博士后科学基金;

关键词：

Quantifying coherence; Coherence measure; Fidelity; Qubit states; QUANTUM; STATES;

D O I：

10.1007/s11128-017-1650-7

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Quantifying coherence is an essential endeavor for both quantum foundations and quantum technologies. In this paper, we put forward a quantitative measure of coherence by following the axiomatic definition of coherence measures introduced in Baumgratz et al. (PhysRev Lett 113: 140401, 2014). Ourmeasure is based on fidelity and analytically computable for arbitrary states of a qubit. As one of its applications, we show that our measure can be used to examine whether a pure qubit state can be transformed into another pure or mixed qubit state only by incoherent operations.

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页数：10

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