Differential phase shift quantum key distribution

摘要: Quantum key distribution (QKD) has been studied as an ultimate method for secure communications, and it now is emerging a technology that can be deployed in real fibre networks. Here, we present our QKD experiments based on the differential phase shift (DPS-QKD) protocol. A DPS-QKD system simple configuration easy to implement with conventional optical communication components, suitable high clock rate system. Moreover, although implemented attenuated laser source, inherently against strong eavesdropping attacks called photon number splitting attacks, which pose serious threat systems sources. We also describe three types of single detectors are high-speed, long-distance QKD: up- conversion detector, superconducting sinusoidally gated InGaAs avalanche photodiode. record setting employed those detectors.