arXiv:quant-ph/0209168AbstractReferencesReviewsResources
Remote state preparation and teleportation in phase space
Matteo G. A. Paris, Mary Cola, Rodolfo Bonifacio
Published 2002-09-30, updated 2003-01-21Version 2
Continuous variable remote state preparation and teleportation are analyzed using Wigner functions in phase space. We suggest a remote squeezed state preparation scheme between two parties sharing an entangled twin beam, where homodyne detection on one beam is used as a conditional source of squeezing for the other beam. The scheme works also with noisy measurements, and provide squeezing if the homodyne quantum efficiency is larger than 50%. Phase space approach is shown to provide a convenient framework to describe teleportation as a generalized conditional measurement, and to evaluate relevant degrading effects, such the finite amount of entanglement, the losses along the line, and the nonunit quantum efficiency at the sender location.