1550 nm Single-Photon Detection for the Demonstration of Unconditionally Secure Fiber-Optic Quantum Key Distribution over 50 km

Akio YOSHIZAWA  Ryosaku KAJI  Hidemi TSUCHIDA  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E86-C   No.9   pp.1800-1804
Publication Date: 2003/09/01
Online ISSN: 
DOI: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Recent Progress in Photon Detection Technology)
Category: 
Keyword: 
1550 nm,  gated-mode single-photon detector,  indium-gallium-arsenide avalanche photodiode,  quantum key distribution,  

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Summary: 
The performance of an indium-gallium-arsenide avalanche photodiode serving as a 1550 nm single-photon detector is investigated. Quantum efficiency is evaluated for laser pulses with an average of < 0.015 photons per pulse, which are important for the demonstration of unconditionally secure quantum key distribution [G. Brassard et al.: Phys. Rev. Lett. 85, 6, p.1330 (2000)]. An operating temperature of 243 K is achieved by thermo-electrical cooling, yielding a quantum efficiency of 18% with a dark-count probability per gate of 2.8 10-5. The results obtained here guarantee unconditionally secure fiber-optic quantum key distribution over 50 km.