Distributing Entanglement with Separable States
Christian Peuntinger, Vanessa Chille, Ladislav Mišta, Natalia Korolkova, Michael Förtsch, Jan Korger, Christoph W. Marquardt, Gerd Leuchs · Physical Review Letters · 2013
We experimentally demonstrate a protocol for entanglement distribution by a separable quantum system. In our experiment, two spatially separated modes of an electromagnetic field get entangled by local operations, classical communication, and transmission of a correlated but separable mode between them. This highlights the utility of quantum correlations beyond entanglement for the establishment of a fundamental quantum information resource and verifies that its distribution by a dual classical and separable quantum communication is possible.