标题： 对量子密钥分发激光源的光泵攻击 显示英文标题

标题： Optical-pumping attack on a quantum key distribution laser source

摘要： 我们报告了量子密钥分发系统实际实现中的一种新型漏洞。 我们表明，不仅可以通过在1550纳米发射波长附近的外部光对其进行注入锁定来增加光源激光二极管的脉冲能量，还可以通过在较短波长处对其进行光学泵浦来增加脉冲能量。 我们通过其光纤尾纤将激光二极管暴露于1310纳米、1.6毫瓦的连续波激光光线下，实现了脉冲能量10%的增加。 这可能允许窃听者窃取秘密密钥。 一种可能的对策是在源的输出处安装宽带光学滤波器和隔离器，并在安全认证期间对其进行表征。 显示英文摘要

摘要： We report a new type of vulnerability in practical implementations of quantum key distribution systems. We show that it is possible to increase the pulse energy of a source laser diode not only by injection-locking it by external light near its emission wavelength of 1550 nm, but also by optically pumping it at a much shorter wavelength. We demonstrate 10% increase in pulse energy when exposing the laser diode to 1310-nm, 1.6-mW cw laser light via its fiber pigtail. This may allow an eavesdropper to steal the secret key. A possible countermeasure is to install broadband optical filters and isolators at the source's output and characterise them during the security certification.