论文标题
量子密钥分布的安全有效同步方案
Secure and efficient synchronization scheme for quantum key distribution
论文作者
论文摘要
为了在量子键分布中的两个用户之间建立时间参考框架，通常用于使用门控模式单光子检测器（SPD）的同步校准过程。传统上，每个SPD的线长度测量值独立地实现了同步校准。但是，这将留下一个漏洞，这是通过特殊攻击在实验上证明的。在这里，我们通过固定所有SPD之间的信号时间窗口的相对延迟，并共同执行线长度测量，并在低精度与高精度同步结合使用后，提出了一个替代同步方案。新方案不仅可以免疫脆弱性，而且还将同步时间从通常几秒钟提高到数十毫秒。
To establish a time reference frame between two users in quantum key distribution, a synchronization calibration process is usually applied for the case of using gated mode single-photon detectors (SPDs). Traditionally, the synchronization calibration is independently implemented by the line length measurement for each SPD. However, this will leave a loophole which has been experimentally demonstrated by a special attack. Here, we propose an alternative synchronization scheme by fixing the relative delay of the signal time window among all SPDs and jointly performing the line length measurement with multiple SPDs under combining low-precision with high-precision synchronization. The new scheme is not only immune to the vulnerability but also improves the synchronization time from usually a few seconds to tens of milliseconds.
