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Experimental quantum-key distribution with an untrusted source

Xiang Peng, Hao Jiang, Bingjie Xu, Xiongfeng Ma, and Hong Guo

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Abstract

The photon statistics of a quantum-key-distribution (QKD) source are crucial for security analysis. We propose a practical method, with only a beam splitter and a photodetector, to monitor the photon statistics of a QKD source. By implementing in a plug and play QKD system, we show that the method is highly practical. The final secure key rate is 52  bit∕s, compared to 78  bit∕s when the source is treated as a trusted source.

© 2008 Optical Society of America

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