General limits for entanglement distribution

Alexander Streltsov

ICFO

Establishing quantum entanglement between two distant parties is an essential step of many protocols in quantum information processing. One possibility for providing long-distance entanglement is to create an entangled composite state within a lab and then physically send one subsystem to a distant lab. Moreover, recent results show that entanglement distribution is even possible by sending a disentangled particle. In this talk we provide general limits for the amount of entanglement which can be distributed between two distant parties. One such limit is given by quantum discord. We also discuss the scenario where the exchanged particle is disentangled, and show that states of rank two cannot be used for entanglement distribution in this case.