Discord as a quantum resource for bi-partite communication

Journal Article · Thu Dec 04 00:00:00 EST 2014 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.4903110· OSTI ID:22390663

Chrzanowski, Helen M.; Assad, Syed M.; Symul, Thomas; Lam, Ping Koy ^[1]; Gu, Mile; Modi, Kavan; Vedral, Vlatko ^[2]; Ralph, Timothy C. ^[3]

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1. Centre for Quantum Computation and Communication Technology, Department of Quantum Science, The Australian National University (Australia)
2. Centre for Quantum Technologies, National University of Singapore (Singapore)
3. Centre for Quantum Computation and Communication Technology, Department of Physics, University of Queensland (Australia)

Coherent interactions that generate negligible entanglement can still exhibit unique quantum behaviour. This observation has motivated a search beyond entanglement for a complete description of all quantum correlations. Quantum discord is a promising candidate. Here, we experimentally demonstrate that under certain measurement constraints, discord between bipartite systems can be consumed to encode information that can only be accessed by coherent quantum interactions. The inability to access this information by any other means allows us to use discord to directly quantify this ‘quantum advantage’.

• OSTI ID: 22390663
• Journal Information: AIP Conference Proceedings, Vol. 1633, Issue 1; Conference: 11. International Conference on Quantum Communication, Measurement and Computation, Vienna (Austria), 30 Jul - 3 Aug 2012; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
CORRELATIONS
DATA TRANSMISSION
LIMITING VALUES
QUANTUM ENTANGLEMENT
QUANTUM INFORMATION