Single Photon Detector at Telecom Wavelengths for Quantum Key Distribution
Liu Yun; Wu Qing-Lin; Han Zheng-Fu; Dai Yi-Min; Guo Guang-Can; Liu Yun; Key Laboratory of Quantum Information, University of Science and Technology of China, Hefei 230026; Wu Qing-Lin; Key Laboratory of Quantum Information, University of Science and Technology of China, Hefei 230026; Han Zheng-Fu; Key Laboratory of Quantum Information, University of Science and Technology of China, Hefei 230026; Dai Yi-Min; Key Laboratory of Quantum Information, University of Science and Technology of China, Hefei 230026; Guo Guang-Can; Key Laboratory of Quantum Information, University of Science and Technology of China, Hefei 230026
Журнал:
Chinese Physics Letters
Дата:
2006-01-01
Аннотация:
Using InGaAs/InP avalanche photodiodes as sensors and coaxial cables as reflection lines to reject spike signals, we have firstly employed the ``timing filtering'' gates to pick out avalanche signals and have realized the single photon detection at 1550 nm in the temperature range of thermoelectric cooling. A ratio of the dark count rate to the detection efficiency was obtained to be 9×10<sup>−5</sup> at 223 K. When the detector is applied to a practical quantum key distribution system, the transmission distance can reach 89.5 km and the repetition rate can reach 0.33 MHz.
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