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Title: The upper bound and continuity of quantum discord
Authors: Xi, Z.
Lu, X.-M. 
Wang, X.
Li, Y.
Issue Date: 16-Sep-2011
Abstract: 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. © 2011 IOP Publishing Ltd.
Source Title: Journal of Physics A: Mathematical and Theoretical
ISSN: 17518113
DOI: 37/375301
Appears in Collections:Staff Publications

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