title: Efficient and low-noise single-photon avalanche photodiode for 1.244-GHz clocked quantum key distribution.
abstract: An efficient and low-noise 1.244-GHz gating InGaAs single-photon avalanche photodiode (SAPD) was developed for a high-speed quantum key distribution (QKD) system. An afterpulsing probability of 0.61% and a dark count probability per gate of 0.71 ×10-6 were obtained at a detection efficiency of 10.9% for 1.55-µm photons. Furthermore, our SAPD successfully coped with high detection efficiency (≤ 25%) and quite low afterpulsing noise (≤ 3% for ≤ 25% efficiency) at the same time. Its potential was verified using the actual QKD setups installed over a metropolitan area network.
authors: Green Innovations Research Laboratories, NEC Corporation, 34 Miyukigaoka, Tsukuba, Ibaraki 305-8501, Japan. y-nambu@ah.jp.nec.com
authors: Y
authors: Y
authors: Nambu
authors: S
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authors: Takahashi
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authors: Yoshino
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authors: Tanaka
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authors: Fujiwara
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authors: Sasaki
authors: A
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authors: Tajima
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authors: Yorozu
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authors: Tomita