期刊
PHYSICS LETTERS A
卷 374, 期 11-12, 页码 1342-1345出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.physleta.2010.01.016
关键词
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资金
- Cariplo Foundation
- Grant Agency of Czech Republic [202/07/J040]
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. (C) 2010 Published by Elsevier B.V.
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