On the Relative Character of Quantum Correlations

Abstract

Nowadays, no one should doubt that quantum entanglement is (at least, one of) the characteristic traits of quantum mechanics. Furthermore, quantum information science is strongly influenced by the advantages provided by quantum entanglement, as the latter can be regarded as a genuine resource for an efficient (better-than-classical) processing of information in certain computational tasks. The very basic notion of correlation is fundamental for the conceptualization of the physical communicational problem and, as a consequence, for the notion of information itself. Thus, the question about the nature of quantum information is close (and unavoidably linked) to the question about the nature of quantum correlations.