Journal
JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL
Volume 44, Issue 37, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1751-8113/44/37/375301
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Funding
- NSFC [60873119, 11025527, 10874151, 10935010]
- Higher School Doctoral Subject Foundation of Ministry of Education of China [200807180005]
- Superior Dissertation Foundation of Shaanxi Normal University [S2009YB03]
- National Research Foundation
- Ministry of Education, Singapore [WBS: R-710-000-008-271]
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Quantum discord is viewed as the measure of quantum correlation which can be nonzero even when entanglement in the system is zero. We study two properties of quantum discord: the upper bound and the continuity. We prove the upper bound of quantum discord in terms of the coherent information for any quantum state and discuss the condition for the reachable upper bound. If two states are close to each other, then we find that quantum discord has little change and provides a bound with respect to this small change.
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