Quantum communication with photon-number entangled states and realistic photodetection

Details Quantum communication with photon-number entangled states and realistic photodetection Quantum communication with photon-number entangled states and realistic photodetection

2010-01-11

arxiv.org/abs/1001.1704v2

Phys. Lett. A 374, 1342 (2010)

Physics

Quantum Physics

8 pages, 2 figures, to appear in Phys. Lett. A

Scientific paper

10.1016/j.physleta.2010.01.016

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. We consider channels based on Gaussian twin-beam states and non-Gaussian two-mode coherent states 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.

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