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Published March 31, 2011 | Published
Journal Article Open

Operational interpretations of quantum discord

Abstract

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.

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.

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August 19, 2023
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