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Chinese Science Bulletin

, Volume 58, Issue 10, pp 1145–1149

First Online: 23 March 2013Received: 03 June 2012Accepted: 10 September 2012DOI: 10.1007-s11434-013-5698-1

Cite this article as: Chen, S., Liu, D., You, L. et al. Chin. Sci. Bull. 2013 58: 1145. doi:10.1007-s11434-013-5698-1

Abstract

We developed a superconducting nanowire single-photon detection SNSPD system based on Gifford-McMahon cryocooler for quantum communication applications. Environmental factors which may influence the system performance are intensively studied. Those factors include temperature fluctuations, the ambient magnetic field and the background radiation. By optimizing the bias circuit, the stability of SNSPD system to electrical noise and disturbance was effectively enhanced, thus making it more suitable for field application. A 4-channel SNSPD system with quantum efficiency higher than 4% at the dark count rate of 10 Hz for λ=1550 nm is integrated and applied into a quantum key distribution QKD experiment. QKD was successfully carried out over 100 km optical fiber with the final secure key rate of 1.6 kbps and the quantum bit error rate of less than 2%.

Keywordssuperconducting nanowire single-photon detection quantum efficiency latching quantum key distribution This article is published with open access at Springerlink.com

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Author: SiJing Chen - DengKuan Liu - LiXing You - YongLiang Wang - LongQing Qiu - XiaoMing Xie - MianHeng Jiang - TengYun Chen - Y

Source: https://link.springer.com/



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