KMS Of Academy of mathematics and systems sciences, CAS
Classical and quantum correlative capacities of quantum systems | |
Li, Nan; Luo, Shunlong | |
2011-10-31 | |
发表期刊 | PHYSICAL REVIEW A |
ISSN | 1050-2947 |
卷号 | 84期号:4页码:4 |
摘要 | How strongly can one system be correlated with another? In the classical world, this basic question concerning correlative capacity has a very satisfying answer: The "effective size" of the marginal system, as quantified by the Shannon entropy, sets a tight upper bound to the correlations, as quantified by the mutual information. Although in the quantum world bipartite correlations, like their classical counterparts, are also well quantified by mutual information, the similarity ends here: The correlations in a bipartite quantum system can be twice as large as the marginal entropy. In the paradigm of quantum discord, the correlations are split into classical and quantum components, and it was conjectured that both the classical and quantum correlations are ( like the classical mutual information) bounded above by each subsystem's entropy. In this work, by exploiting the interplay between entanglement of formation, mutual information, and quantum discord, we disprove that conjecture. We further indicate a scheme to restore harmony between quantum and classical correlative capacities. The results illustrate dramatically the asymmetric nature of quantum discord and highlight some subtle and unusual features of quantum correlations. |
DOI | 10.1103/PhysRevA.84.042124 |
语种 | 英语 |
资助项目 | National Center for Mathematics and Interdisciplinary Sciences[Y029152K51] |
WOS研究方向 | Optics ; Physics |
WOS类目 | Optics ; Physics, Atomic, Molecular & Chemical |
WOS记录号 | WOS:000296328600004 |
出版者 | AMER PHYSICAL SOC |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://ir.amss.ac.cn/handle/2S8OKBNM/11461 |
专题 | 应用数学研究所 |
通讯作者 | Li, Nan |
作者单位 | Chinese Acad Sci, Acad Math & Syst Sci, Beijing 100190, Peoples R China |
推荐引用方式 GB/T 7714 | Li, Nan,Luo, Shunlong. Classical and quantum correlative capacities of quantum systems[J]. PHYSICAL REVIEW A,2011,84(4):4. |
APA | Li, Nan,&Luo, Shunlong.(2011).Classical and quantum correlative capacities of quantum systems.PHYSICAL REVIEW A,84(4),4. |
MLA | Li, Nan,et al."Classical and quantum correlative capacities of quantum systems".PHYSICAL REVIEW A 84.4(2011):4. |
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