Published March 31, 2011
| Version Published
Journal Article
Open
Operational interpretations of quantum discord
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1.
Centre for Quantum Technologies
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2.
Institute of Photonic Sciences
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3.
California Institute of Technology
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4.
University of Waterloo
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5.
University of Bristol
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.Attached Files
Published - Cavalcanti2011p13454Phys_Rev_A.pdf
Files
Cavalcanti2011p13454Phys_Rev_A.pdf
Additional details
Identifiers
- Eprint ID
- 23402
- Resolver ID
- CaltechAUTHORS:20110421-074712861
Funding
- NSF
- Ministry of Education of Singapure
- Spanish Juan de la Cierva Programme
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- QuantumWorks
- Ontario Centres of Excellence
- Royal Society
- Engineering and Physical Sciences Research Council (EPSRC)
- European Commission
Dates
- Created
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2011-04-21Created from EPrint's datestamp field
- Updated
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2021-11-09Created from EPrint's last_modified field