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We give a pedagogical introduction to quantum discord. We the discuss theproblem of separation of total correlations in a given quantum state intoentanglement, dissonance, and classical correlations using the concept ofrelative entropy as a distance measure of correlations. This allows us to putall correlations on an equal footing. Entanglement and dissonance, whosedefinition is introduced here, jointly belong to what is known as quantumdiscord. Our methods are completely applicable for multipartite systems ofarbitrary dimensions. We finally show, using relative entropy, how differentnotions of quantum correlations are related to each other. This gives a singletheory that incorporates all correlations, quantum, classical, etc.

Unification of quantum and classical correlations and quantumness measures