title: Unified view of quantum and classical correlations.
abstract: We discuss the problem of the separation of total correlations in a given quantum state into entanglement, dissonance, and classical correlations using the concept of relative entropy as a distance measure of correlations. This allows us to put all correlations on an equal footing. Entanglement and dissonance, whose definition is introduced here, jointly belong to what is known as quantum discord. Our methods are completely applicable for multipartite systems of arbitrary dimensions. We investigate additivity relations between different correlations and show that dissonance may be present in pure multipartite states.
authors.affiliation: Centre for Quantum Technologies, National University of Singapore, Singapore. kavmodi@gmail.com
authors.forename: Kavan
authors.initials: K
authors.lastname: Modi
authors.forename: Tomasz
authors.initials: T
authors.lastname: Paterek
authors.forename: Wonmin
authors.initials: W
authors.lastname: Son
authors.forename: Vlatko
authors.initials: V
authors.lastname: Vedral
authors.forename: Mark
authors.initials: M
authors.lastname: Williamson