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We have demonstrated an ultra low noise up-conversion single photon detector using a periodically poled lithium niobate waveguide. The dark count rate of this detector is lower than 100 counts/second at 10% detection efficiency.
We have experimentally implemented a differential phase shift quantum-key distribution system with up-conversion detectors operating at a 2.5 Gbps clock rate. A Michelson interferometer with Faraday mirrors is used to increase the system stability.
A detection-time-bin-shift scheme for polarization encoding QKD is proposed. This scheme reduces cost and overcomes the security loss caused by dead-time and unbalanced characteristics of detectors. This scheme is experimentally demonstrated with the B92 protocol.
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