Title: Quantum Clock Synchronization Network with Silicon-chip Dual-Pumped Entangled Photon Source Show Chinese title

Title: 基于硅芯片双泵浦纠缠光子源的量子钟同步网络

Abstract: In this paper, we propose a quantum clock synchronization (QCS) network scheme with silicon-chip dual-pumped entangled photon source. This scheme couples two pump beams into the silicon-based waveguide, where degenerate and non-degenerate spontaneous four-wave mixing (SFWM) occurs, generating entanglement between one signal channel and three idler channels. The entangled photons are distributed to remote users through the wavelength division multiplexing strategy to construct an entanglement distribution network, and the round-trip QCS is adopted to realize a QCS network that can serve multiple users. A proof-of-principle QCS network experiment is implemented among the server and multiple users (Alice, Bob, and Charlie) for 11.1 hours, where Alice and Charlie are 10 km away from the server and Bob is 25 km away from the server. The lowest time deviations (TDEV) between the server and each user (Alice, Bob, and Charlie) are 1.57 ps, 0.82 ps and 2.57 ps at the average time of 8000 s, 8000 s and 800 s respectively. The results show that the QCS network scheme with dual-pumped SFWM photon source proposed by us achieves high accuracy, and the channel resources used by n users are reduced by about 30% compared with other round-trip QCS schemes. Show Chinese abstract

Abstract: 在本文中，我们提出了一种基于硅芯片双泵浦纠缠光子源的量子钟同步（QCS）网络方案。该方案将两个泵浦光束耦合到基于硅的波导中，其中发生简并和非简并自发四波混频（SFWM），在信号通道和三个闲置通道之间产生纠缠。通过波分复用策略将纠缠光子分发给远程用户，以构建纠缠分发网络，并采用往返式QCS来实现可服务多个用户的QCS网络。在一个服务器和多个用户（爱丽丝、鲍勃和查理）之间进行了原理验证的QCS网络实验，持续时间为11.1小时，其中爱丽丝和查理距离服务器10公里，鲍勃距离服务器25公里。服务器与每个用户（爱丽丝、鲍勃和查理）之间的最低时间偏差（TDEV）分别为8000秒、8000秒和800秒时的1.57皮秒、0.82皮秒和2.57皮秒。结果表明，我们提出的具有双泵浦SFWM光子源的QCS网络方案实现了高精度，与其它往返式QCS方案相比，n个用户的信道资源减少了约30%。