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We derive quantitative relations among several naturally defined measures ofclassical and nonclassical correlations in a bipartite quantum state. We alsoobtain an upper bound of entanglement irreversibility and a sufficientcondition for reversible entanglement. The additivity of entanglement offormation is directly related to the additivity of quantum discord as well as acertain measure of classical correlation.

Correlation measures in bipartite states and entanglement irreversibility