We address the effects of realistic photodetection, with nonunit quantum efficiency and background noise (dark counts), on the performances of quantum communication schemes based on photon-number entangled states (PNES). We consider channels based on Gaussian twin-beam states (TWB) and non-Gaussian two-mode coherent states (TMC) and evaluate the channel capacity by optimizing the bit discrimination threshold. We found that TWB-based channels are more robust against noise than TMC-based ones and that this result is almost independent on the statistics of dark counts.
|Titolo:||Quantum communication with photon-number entangled states and realistic photodetection|
PARIS, MATTEO (Ultimo)
|Settore Scientifico Disciplinare:||Settore FIS/03 - Fisica della Materia|
|Data di pubblicazione:||2010|
|Digital Object Identifier (DOI):||10.1016/j.physleta.2010.01.016|
|Appare nelle tipologie:||01 - Articolo su periodico|