Interference of two intense entanglement sources: entanglement swapping and multi-partite entanglement
O. Glöckl, Stefan Lorenz, Christoph W. Marquardt, J. Heersink, Q. Pan, Peter van Loock, Natalia Korolkova, Gerd Leuchs · 2004
Progress of entanglement swapping experiment is reported. Four highly correlated modes are created by the interference of two entangled systems. As calculations show, there are strong hints that the state is indeed multi-partite entangled.