Quantum discord, local operations, and Maxwell's demons

Journal Article · Tue Jun 15 00:00:00 EDT 2010 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.81.062103· OSTI ID:21413177

Brodutch, Aharon; Terno, Daniel R ^[1]

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1. Department of Physics and Astronomy, Faculty of Science, Macquarie University, New South Wales 2109 (Australia)

Quantum discord was proposed as a measure of the quantumness of correlations. There are at least three different discordlike quantities, two of which determine the difference between the efficiencies of a Szilard's engine under different sets of restrictions. The three discord measures vanish simultaneously. We introduce an easy way to test for zero discord, relate it to the Cerf-Adami conditional entropy and show that there is no simple relation between the discord and the local distinguishability.

• OSTI ID: 21413177
• Journal Information: Physical Review. A, Vol. 81, Issue 6; Other Information: DOI: 10.1103/PhysRevA.81.062103; (c) 2010 The American Physical Society; ISSN 1050-2947
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
CORRELATIONS
EFFICIENCY
ENGINES
ENTROPY
PHYSICAL PROPERTIES
THERMODYNAMIC PROPERTIES