All entangled states are useful for information processing

Ll. Masanes

Published 2005-08-09, updated 2006-02-01Version 3

The question whether all entangled states can be used as a nonclassical resource has remained open so far. Here we provide a conclusive answer to this problem for the case of systems shared by two parties. We show that any entangled state $\sigma$ can enhance the teleportation power of some other state. This holds even if the state $\sigma$ is bound entangled.