Quantum discord, local operations, and Maxwell's demons

Aharon Brodutch*, Daniel R. Terno

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

102 Citations (Scopus)


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.

Original languageEnglish
Article number062103
Pages (from-to)1-6
Number of pages6
JournalPhysical Review A - Atomic, Molecular, and Optical Physics
Issue number6
Publication statusPublished - 4 Jun 2010


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