Release Time:2019-03-09  Hits:

Indexed by: Journal Article

Date of Publication: 2014-06-01

Journal: QUANTUM INFORMATION PROCESSING

Included Journals: EI、SCIE

Volume: 13

Issue: 6

Page Number: 1437-1456

ISSN: 1570-0755

Key Words: Quantum correlation; Quantum entanglement; Quantum coherence

Abstract: 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.