Journal
PHYSICAL REVIEW A
Volume 85, Issue 3, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.85.032109
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Funding
- Superior Dissertation Foundation of Shaanxi Normal University [S2009YB03]
- National Research Foundation
- Ministry of Education, Singapore [WBS: R-710-000-008-271]
- NFRPC [2012CB921602]
- NSFC [11025527, 10935010, 60873119]
- Higher School Doctoral Subject Foundation of Ministry of Education of China [200807180005]
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We revisit the upper bound of quantum discord given by the von Neumann entropy of the measured subsystem. Using the Koashi-Winter relation, we obtain a tradeoff between the amount of classical correlation and quantum discord in the tripartite pure states. The difference between the quantum discord and its upper bound is interpreted as a measure on the classical correlative capacity. Further, we give the explicit characterization of the quantum states saturating the upper bound of quantum discord, through the equality condition for the Araki-Lieb inequality. We also demonstrate that the saturating of the upper bound of quantum discord precludes any further correlation between the measured subsystem and the environment.
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