Countermeasure against blinding attack for single-photon detectors in quantum key distribution

Author:

Jiang Lianjun,Li Dongdong,Fang Yuqiang,Zhao Meisheng,Liu Ming,Xie Zhilin,Zhao Yukang,Tang Yanlin,Jiang Wei,Fang Houlin,Ma Rui,Cheng Lei,Yang Weifeng,Han Songtao,Tang Shibiao

Abstract

Abstract Quantum key distribution (QKD), rooted in quantum mechanics, offers information-theoretic security. However, practical systems open security threats due to imperfections, notably bright-light blinding attacks targeting single-photon detectors. Here, we propose a concise, robust defense strategy for protecting single-photon detectors in QKD systems against blinding attacks. Our strategy uses a dual approach: detecting the bias current of the avalanche photodiode (APD) to defend against continuous-wave blinding attacks, and monitoring the avalanche amplitude to protect against pulsed blinding attacks. By integrating these two branches, the proposed solution effectively identifies and mitigates a wide range of bright light injection attempts, significantly enhancing the resilience of QKD systems against various bright-light blinding attacks. This method fortifies the safeguards of quantum communications and offers a crucial contribution to the field of quantum information security.

Publisher

IOP Publishing

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