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Single Photon Detector at Telecom Wavelengths for Quantum Key Distribution |
LIU Yun;WU Qing-Lin;HAN Zheng-Fu;DAI Yi-Min;GUO Guang-Can |
Key Laboratory of Quantum Information, University of Science and Technology of China, Hefei 230026 |
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Cite this article: |
LIU Yun, WU Qing-Lin, HAN Zheng-Fu et al 2006 Chin. Phys. Lett. 23 252-255 |
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Abstract 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 1550nm in the temperature range of thermoelectric cooling. A ratio of the dark count rate to the detection efficiency was obtained to be 9×10-5 at 223K. When the detector is applied to a practical quantum key distribution system, the transmission distance can reach 89.5km and the repetition rate can reach 0.33MHz.
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Keywords:
85.60.Dw
85.60.Gz
03.67.Dd
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Published: 01 January 2006
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PACS: |
85.60.Dw
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(Photodiodes; phototransistors; photoresistors)
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85.60.Gz
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(Photodetectors (including infrared and CCD detectors))
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03.67.Dd
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(Quantum cryptography and communication security)
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