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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