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Continuous-variable teleportation in the characteristic-function

Domenii publicaţii > Fizica + Tipuri publicaţii > Articol în revistã ştiinţificã

Autori: Paulina Marian and Tudor A. Marian

Editorial: American Physical Society, American Institute of Physics, Physical Review A, 74, p.042306, 2006.


We give a description of the continuous-variable teleportation protocol in terms of the characteristic functions of the quantum states involved.
The Braunstein–Kimble protocol is written for an unbalanced homodyne measurement and arbitrary input and resource states. We show that the output of the protocol is a superposition between the input one-mode field and a classical one induced by measurement and
classical communication. We choose to describe the input state distortion through teleportation by the average photon number of the measurement-induced field. Only in the case of symmetric Gaussian resource states we find a relation between the optimal added noise and the minimal EPR correlations used to define inseparability.

Cuvinte cheie: teleportation, entanglement, continuous variable