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作者机构:Shaanxi Normal Univ Coll Comp Sci Xian 710062 Shaanxi Peoples R China Xian Univ Posts & Telecommun Sch Sci Xian 710061 Shaanxi Peoples R China Chinese Acad Sci Inst Phys Beijing Natl Lab Condensed Matter Phys Beijing 100190 Peoples R China Univ Chinese Acad Sci Sch Phys Sci Beijing 100190 Peoples R China Collaborat Innovat Ctr Quantum Matter Beijing 100190 Peoples R China
出 版 物:《QUANTUM INFORMATION PROCESSING》 (Quantum Inf. Process.)
年 卷 期:2018年第17卷第2期
页 面:1-11页
核心收录:
学科分类:07[理学] 070201[理学-理论物理] 0702[理学-物理学]
基 金:NSFC [61671280, 11531009, 11675129, 11671244, 91536108] Natural Science Basic Research Plan in Shaanxi Province of China [2017KJXX-92] Funded Projects for the Academic Leaders and Academic Backbones, Shaanxi Normal University [16QNGG013] Fundamental Research Funds for the Central Universities [GK201502004] MOST of China [2016YFA0302104] CAS [XDB01010000, XDB21030300]
主 题:Coherence Quantum correlations Distributed coherence Quantum operation
摘 要:Coherence is a basic feature of quantum systems and a common necessary condition for quantum correlations. It is also an important physical resource in quantum information processing. In this paper, using relative entropy, we consider a more general definition of the cohering power of quantum operations. First, we calculate the cohering power of unitary quantum operations and show that the amount of distributed coherence caused by non-unitary quantum operations cannot exceed the quantum-incoherent relative entropy between system of interest and its environment. We then find that the difference between the distributed coherence and the cohering power is larger than the quantum-incoherent relative entropy. As an application, we consider the distributed coherence caused by purification.