论文标题
部分可观测时空混沌系统的无模型预测
Explicit attacks on BB84 with distinguishable photons
论文作者
论文摘要
非手术自由度中光子的区分性损害了量子密钥分布的无条件安全性，因为窃听器可以通过利用这种区分性来改善攻击策略。但是，在光源侧通道存在下的最佳窃听策略尚不清楚。在这里，我们在BB84方案上提供了几种明确的攻击策略，并具有部分可区分的光子。特别是，我们考虑相关的克隆攻击，在没有侧通道的情况下，这是最佳的，并表明在存在侧通道的情况下有更好的策略。改进的策略利用了侧通道状态的测量，然后对信号光子进行攻击。我们的结果明确表明了临界错误率的降低，并将上限设定为实际的秘密关键率。
Distinguishability of photons in non-operational degrees of freedom compromises unconditional security of quantum key distribution since an eavesdropper can improve attack strategies by exploiting this distinguishability. However, the optimal eavesdropping strategies in the presence of light source side channels are not known. Here we provide several explicit attack strategies on the BB84 protocol with partially distinguishable photons. In particular, we consider the phase-covariant cloning attack, which is optimal in the absence of side channels, and show that there are even better strategies in the presence of side channels. The improved strategies exploit a measurement of the side channel state followed by an attack on the signal photon. Our results explicitly demonstrate reduction of the critical error rate, and set an upper bound on the practical secret key rate.
