论文标题
绝对时钟与单个时间相关的光子对源超过10 km的同步
Absolute clock synchronization with a single time-correlated photon pair source over 10km
论文作者
论文摘要
我们基于在单个自发参数下转换（SPDC）源中生成的双向传播光子基于双向传播光子的点对点时钟同步协议。光子对之间的紧密定时相关性用于确定由两个单独的时钟测量的单程和往返时间，为无距离独立的绝对同步提供了足够的信息，以防止对称延迟攻击。我们表明，可以使用10 \，km电信光纤建立的同步通道的往返时间的重合签名可从光纤末端反射的光子得出，而无需其他光学。我们的技术允许多个时钟与与源共同划分的单个参考时钟同步，而无需其他对源，以适用于同步时钟网络的客户端服务器配置。
We demonstrate a point-to-point clock synchronization protocol based on bidirectionally propagating photons generated in a single spontaneous parametric down-conversion (SPDC) source. Tight timing correlations between photon pairs are used to determine the single and round-trip times measured by two separate clocks, providing sufficient information for distance-independent absolute synchronization secure against symmetric delay attacks. We show that the coincidence signature useful for determining the round-trip time of a synchronization channel, established using a 10\,km telecommunications fiber, can be derived from photons reflected off the end face of the fiber without additional optics. Our technique allows the synchronization of multiple clocks with a single reference clock co-located with the source, without requiring additional pair sources, in a client-server configuration suitable for synchronizing a network of clocks.
