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Remote state preparation and teleportation in phase space

2003; IOP Publishing; Volume: 5; Issue: 3 Linguagem: Inglês

10.1088/1464-4266/5/3/370

1741-3575

Matteo G. A. Paris, Mary M. Cola, Rodolfo Bonifacio,

Quantum Mechanics and Applications

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.