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Operational interpretations of quantum discord

Cavalcanti, D. and Aolita, L. and Boixo, S. and Modi, K. and Piani, M. and Winter, A. (2011) Operational interpretations of quantum discord. Physical Review A, 83 (3). Art. No. 032324. ISSN 1050-2947.

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Quantum discord quantifies nonclassical correlations beyond the standard classification of quantum states into entangled and unentangled. Although it has received considerable attention, it still lacks any precise interpretation in terms of some protocol in which quantum features are relevant. Here we give quantum discord its first information-theoretic operational meaning in terms of entanglement consumption in an extended quantum-state-merging protocol. We further relate the asymmetry of quantum discord with the performance imbalance in quantum state merging and dense coding.

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Additional Information:©2011 American Physical Society. Received 25 August 2010; published 31 March 2011. We thank A. Acín, C. Bény, J. Calsamiglia, C. Caves, A. Datta, M. Gu, and V. Vedral for valuable comments. This work was supported by the National Research Foundation, the Ministry of Education of Singapore, the Spanish “Juan de la Cierva” Programme, NSERC, Quantum Works, Ontario Centres of Excellence, the Royal Society, UK EPSRC, and the European Commission.
Funding AgencyGrant Number
Ministry of Education of SingapureUNSPECIFIED
Spanish Juan de la Cierva ProgrammeUNSPECIFIED
Natural Sciences and Engineering Research Council of Canada (NSERC)UNSPECIFIED
Ontario Centres of ExcellenceUNSPECIFIED
Engineering and Physical Sciences Research Council (EPSRC)UNSPECIFIED
European CommissionUNSPECIFIED
Issue or Number:3
Classification Code:PACS: 03.67.Ac
Record Number:CaltechAUTHORS:20110421-074712861
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Official Citation:Operational interpretations of quantum discord D. Cavalcanti, L. Aolita, S. Boixo, K. Modi, M. Piani, and A. Winter Published 31 March 2011 (5 pages) 032324
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:23402
Deposited By: Ruth Sustaita
Deposited On:21 Apr 2011 15:10
Last Modified:03 Oct 2019 02:46

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