Correlations in quantum mechanics often exhibit non-classical features. Among these are non-locality and entanglement, with the latter being a prerequisite for the former. In recent years it has been recognized that the non-classicality (or quantumness) of correlations actually goes beyond entanglement, in the sense that it can be present even in unentangled states. An example of this is quantum discord, which roughly corresponds to the gap between the total amount of correlations contained in a distributed quantum state and the amount of classical correlations that can be extracted via local measurements.

Interest in the more general non-classicality of correlations has recently surged for at least two reasons:
  • On one hand, there is the possibility that such general quantumness is a key feature in some quantum processing tasks, including mixed-state quantum computation. A better understanding of the role of general non-classicality in quantum information processing will make the harnessing of quantum behavior more effective, in particular in the presence of noise.

  • On the other hand, by assuming a larger perspective and rethinking critically about the non-classicality of correlations we may gain a better understanding also of "more familiar" topics, for example of entanglement itself, or of the measurement process.
This mini-workshop brings together a small group of researchers and students working actively on the general non-classicality of correlations. The aim is that of sharing the latest developments and ideas in this area of research, spurring discussions, strengthening existing collaborations, and establishing new ones.