Remote state preparation and teleportation in phase space

Details Remote state preparation and teleportation in phase space Remote state preparation and teleportation in phase space

2002-09-30

arxiv.org/abs/quant-ph/0209168v2

J. Opt. B vol 5, S360 (2003)

Physics

Quantum Physics

2 figures, revised version to appear in J.Opt.B

Scientific paper

10.1088/1464-4266/5/3/370

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.

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