Coauthors: Daniel Terno

The non local nature of quantum mechanics allows for stronger correlations between two distant parties then those of the classical world. Entanglement is the strongest manifestation of these quantum correlations but it seems that non locality can exist without any entanglement. A possible measure for the "quantumness of correlations" is the discord [1,2]. Zero discord which implies no quantum correlations is a rare property of mixed quantum states. Those states which exhibit zero discord are important in measurement theory and in evolution of the subsystems. We will look at some of the properties of zero discord states and show that in most cases there is an efficient way to verify zero discord.