Zhang Xinhui, Wang Anbang, Xu Junpei, Sun Yuehui, Mo Laihong, Zhang Yuhe, Qin Yuwen, Wang Yuncai
Opt Express. 2023 Oct 23;31(22):35720-35729. doi: 10.1364/OE.500536.
We propose and numerically demonstrate chaos synchronization of two vertical-cavity surface-emitting lasers (VCSELs) induced by common injection of constant-amplitude random-polarization light for physical key distribution. Results show that synchronization is sensitive to polarization rotation of injection light, and synchronization coefficients larger than 0.9 can be achieved as the rotation-degree mismatch is smaller than ±10°. Therefore, polarization rotation degree can serve as a hardware key parameter. Furthermore, each laser's output has no correlation to the constant amplitude of the injected light. Their components with identical polarization state, e.g. x or y polarization of VCSEL, also have low correlation coefficient smaller than 0.2. It is therefore believed that this synchronization scheme can provide a security-enhanced method of physical key distribution.
我们提出并通过数值模拟证明，通过注入恒定幅度的随机偏振光来实现两个垂直腔面发射激光器（VCSEL）的混沌同步，用于物理密钥分发。结果表明，同步对注入光的偏振旋转敏感，当旋转度失配小于±10°时，可实现大于0.9的同步系数。因此，偏振旋转度可作为硬件密钥参数。此外，每个激光器的输出与注入光的恒定幅度无关。它们具有相同偏振态的分量，例如VCSEL的x或y偏振，其相关系数也很低，小于0.2。因此，人们认为这种同步方案可以提供一种增强安全性的物理密钥分发方法。
