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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
IEICE TRANSACTIONS on Electronics
Publication Date: 2003/09/01
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Recent Progress in Photon Detection Technology)
1550 nm, gated-mode single-photon detector, indium-gallium-arsenide avalanche photodiode, quantum key distribution,
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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.