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Experimental quantum-key distribution with an untrusted source

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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  bits, compared to 78  bits when the source is treated as a trusted source.

© 2008 Optical Society of America

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