Opt Express. 2023 Mar 27;31(7):11431-11446. doi: 10.1364/OE.480486.
We investigate the coexistence of clock synchronization protocols with quantum signals in a common single-mode optical fiber. By measuring optical noise between 1500 nm to 1620 nm we demonstrate a potential for up to 100 quantum, 100 GHz wide channels coexisting with the classical synchronization signals. Both "White Rabbit" and pulsed laser-based synchronization protocols were characterized and compared. We establish a theoretical limit of the fiber link length for coexisting quantum and classical channels. The maximal fiber length is below approximately 100 km for off-the-shelf optical transceivers and can be significantly improved by taking advantage of quantum receivers.
我们研究了在单模光纤中时钟同步协议与量子信号共存的问题。通过测量 1500nm 至 1620nm 之间的光噪声，我们证明了多达 100 个量子、100GHz 宽的信道与经典同步信号共存的可能性。我们对“White Rabbit”和基于脉冲激光的同步协议进行了表征和比较。我们建立了量子和经典信道共存的光纤链路长度的理论限制。对于现成的光收发器，最大光纤长度低于约 100km，通过利用量子接收器，可以显著提高这个长度。
