Max Planck Institute for the Science of Light, Günther-Scharowsky-Straße 1, Bau 24, 91058 Erlangen, Germany.
Phys Rev Lett. 2011 Sep 9;107(11):110501. doi: 10.1103/PhysRevLett.107.110501.
Characterizing the physical channel and calibrating the cryptosystem hardware are prerequisites for establishing a quantum channel for quantum key distribution (QKD). Moreover, an inappropriately implemented calibration routine can open a fatal security loophole. We propose and experimentally demonstrate a method to induce a large temporal detector efficiency mismatch in a commercial QKD system by deceiving a channel length calibration routine. We then devise an optimal and realistic strategy using faked states to break the security of the cryptosystem. A fix for this loophole is also suggested.
对物理信道进行特征化和对密码系统硬件进行校准是建立量子密钥分发（QKD）量子信道的前提条件。此外，不当实现的校准程序可能会打开一个致命的安全漏洞。我们提出并实验证明了一种通过欺骗信道长度校准程序在商业 QKD 系统中引入大的时间探测器效率失配的方法。然后，我们使用伪造态设计了一种打破密码系统安全性的最优和现实策略。还提出了一种针对该漏洞的修复方法。
