Multipartite entanglement for continuous variables: A quantum teleportation network
We show that one single-mode squeezed state distributed among N parties using linear optics suffices to produce a truly N-partite entangled state for any nonzero squeezing and arbitrarily many parties. From this N-partite entangled state, via quadrature measurements of N-2 modes, bipartite entanglement between any two of the N parties can be "distilled," which enables quantum teleportation with an experimentally determinable fidelity better than could be achieved in any classical scheme.
van Loock P
Quantum Optics and Information Group, School of Informatics, University of Wales, Bangor LL57 1UT, United Kingdom.
Braunstein
SL