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论文类型：期刊论文

发表时间：2014-06-01

发表刊物：QUANTUM INFORMATION PROCESSING

收录刊物：SCIE、EI

卷号：13

期号：6

页面范围：1437-1456

ISSN号：1570-0755

关键字：Quantum correlation; Quantum entanglement; Quantum coherence

摘要：Quantum correlation includes quantum entanglement and quantum discord. Both entanglement and discord have a common necessary condition-quantum coherence or quantum superposition. In this paper, we attempt to give an alternative understanding of how quantum correlation is related to quantum coherence. We divide the coherence of a quantum state into several classes and find the complete coincidence between geometric (symmetric and asymmetric) quantum discords and some particular classes of quantum coherence. We propose a revised measure for total coherence and find that this measure can lead to a symmetric version of geometric quantum correlation, which is analytic for two qubits. In particular, this measure can also arrive at a monogamy equality on the distribution of quantum coherence. Finally, we also quantify a remaining type of quantum coherence and find that for two qubits, it is directly connected with quantum nonlocality.