作者
Anastasiya Ponosova, Daria Ruzhitskaya, Poompong Chaiwongkhot, Vladimir Egorov, Vadim Makarov, Anqi Huang
发表日期
2022/10/1
期刊
PRX Quantum
卷号
3
期号
4
页码范围
040307
出版商
American Physical Society
简介
A well-protected and characterized source in a quantum key distribution system is needed for its security. Unfortunately, the source is vulnerable to light-injection attacks, such as Trojan-horse, laser-seeding, and laser-damage attacks, in which an eavesdropper actively injects bright light to hack the source unit. The hacking laser could be a high-power one that can modify properties of components via the laser-damage attack and also further help the Trojan-horse and other light-injection attacks. Here we propose a countermeasure against the light-injection attacks, consisting of an additional sacrificial component placed at the exit of the source. This component should either withstand high-power incoming light while attenuating it to a safe level that cannot modify the rest of the source, or get destroyed into a permanent high-attenuation state that breaks up the line. We demonstrate experimentally that off-the-shelf …
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