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ORIGINAL PAPER: Afterpulse analysis for passive decoy quantum key distribution

机译：原始论文:跟随脉冲分析被动诱饵量子密钥分发

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摘要

The passive decoy method, a candidate for high-speed quantum key distribution (QKD), can prepare laser pulses with various photon-number distributions according to the responses of the transmitter's detectors, which usually adopts the single-photon avalanche photodiode (SPAD) in QKD. As an intrinsic characteristic of the SPAD, the afterpulse can introduce random detector responses, however, is regrettably ignored in passive schemes. Here we develop an analytical model for passive schemes in the finite-resource regime to describe the afterpulse effect on the detectors of both transmitter and receiver. The photon-number distributions biased by afterpulses are corrected, which reveals that the secure key rate is significantly overrated when the afterpulse is ignored. Moreover, our model can increase the tolerance of passive decoy source to afterpulse effect as the result shows that the secret key rates are comparable at different afterpulse probability by reoptimization.
机译：被动假法,一个候选人高速量子密钥分配(QKD)准备使用各种photon-number激光脉冲根据反应的分布发射机的探测器,通常采用单光子雪崩光电二极管在QKD (SPAD)。为SPAD的内在特征,跟随脉冲可以引入随机探测器反应,然而,令人遗憾的是忽略的被动的计划。在有限的资源模型被动方案政权描述跟随脉冲影响探测器的发射机和接收机。跟随脉冲photon-number分布有偏见纠正,这表明安全钥匙吗率时明显被高估了跟随脉冲将被忽略。增加被动诱饵源的宽容结果表明,剩余脉冲的影响密钥利率相当不同跟随脉冲以概率。

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