200km Decoy-state quantum key distribution with photon polarization

We demonstrate the decoy-state quantum key distribution over 200 km with photon polarization through optical fiber, by using superconducting single photon detector with a repetition rate of 320 Mega Hz and a dark count rate of lower than 1 Hz. Since we have used the polarization coding, the synchronization pulses can be run in a low frequency. The final key rate is 14.1 Hz. The experiment lasts for 3089 seconds with 43555 total final bits. © 2009 Optical Society of America OCIS codes: (270.0270) Quantum optics; (060.0060) Fiber optics and optical communications; (060.5565) Quantum communications. References and links 1. C. H. Bennett and G. Brassard, “Quantum cryptography: public key distribution and coin tossing,” in Proceedings of the IEEE International Conferenceon Computers, Systems and Signal Processing, (Bangalore, India, 1984), pp. 175–179. 2. N. Gisin, G. Ribordy, W. Tittel, and H. Zbinden, “Quantum cryptography”, Rev. Mod. Phys. 74, 145 (2002). 3. M. Dusek, N. 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