Best-Practice Criteria for Practical Security of Self-Differencing Avalanche Photodiode Detectors in Quantum Key Distribution
Best-Practice Criteria for Practical Security of Self-Differencing Avalanche Photodiode Detectors in Quantum Key Distribution
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DOI：
10.1103/physrevapplied.9.044027
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发表时间：
2017-12
影响因子：
4.6
通讯作者：
A. Koehler-Sidki;J. Dynes;Marco Lucamarini;G. L. Roberts;A. Sharpe;Zhiliang Yuan;A. Shields
中科院分区：
文献类型：
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作者：
A. Koehler-Sidki;J. Dynes;Marco Lucamarini;G. L. Roberts;A. Sharpe;Zhiliang Yuan;A. Shields
©2018美国物理学会。快速门控雪崩光电二极管（apd）是高比特率量子密钥分发（QKD）中最常用的单光子探测器。它们对外部攻击的健壮性对于QKD系统甚至整个QKD网络的整体安全性至关重要。我们研究了强光照下千兆赫门控自分化（In,Ga）As APD的行为，这是Eve经常使用的一种策略，可以将探测器置于她的控制之下。我们的实验和建模表明，光电流的负反馈通过降低其雪崩概率和/或增强电容响应来保护探测器免于失明。基于这一发现，我们提出了一套设计和操作快速门控APD探测器的最佳实践标准，以确保其在QKD中的实际安全性。
© 2018 American Physical Society. Fast-gated avalanche photodiodes (APDs) are the most commonly used single photon detectors for high-bit-rate quantum key distribution (QKD). Their robustness against external attacks is crucial to the overall security of a QKD system, or even an entire QKD network. We investigate the behavior of a gigahertz-gated, self-differencing (In,Ga)As APD under strong illumination, a tactic Eve often uses to bring detectors under her control. Our experiment and modeling reveal that the negative feedback by the photocurrent safeguards the detector from being blinded through reducing its avalanche probability and/or strengthening the capacitive response. Based on this finding, we propose a set of best-practice criteria for designing and operating fast-gated APD detectors to ensure their practical security in QKD.