All Bipartite Entangled States Are Useful for Information Processing
Lluís Masanes · Physical Review Letters · 2006
The question of 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 can enhance the teleportation power of some other state. This holds even if the state is bound entangled.