Quantum two-way time transfer over a hybrid free-space and fiber link
- URL: http://arxiv.org/abs/2212.01741v1
- Date: Sun, 4 Dec 2022 04:15:37 GMT
- Title: Quantum two-way time transfer over a hybrid free-space and fiber link
- Authors: Xiao Xiang, Bingke Shi, Runai Quan, Yuting Liu, Zhiguang Xia, Huibo
Hong, Tao Liu, Jincai Wu, Jia Qiang, Jianjun Jia, Shougang Zhang, Ruifang
Dong
- Abstract summary: First Q-TWTT experimental demonstration over a hybrid link of 2 km-long turbulent free space and 7 km-long field fiber is reported.
Time transfer performance lasting for overnights has been realized with time stability in terms of time deviation far below 1 picosecond.
- Score: 3.3985865098378896
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: As the superiority of quantum two-way time transfer (Q-TWTT) has been proved
convincingly over fiber links, its implementation on free-space links becomes
an urgent need for remote time transfer expanding to the transcontinental
distance. In this paper, the first Q-TWTT experimental demonstration over a
hybrid link of 2 km-long turbulent free space and 7 km-long field fiber is
reported. Despite the significant loss of more than 25 dB and atmospheric
turbulence, reliable time transfer performance lasting for overnights has been
realized with time stability in terms of time deviation far below 1 picosecond.
This achievement shows the good feasibility of quantum-enhanced time transfer
in the space-ground integrated optical links and nicely certifies the
capability of Q-TWTT in comparing and synchronizing the state-of-the-art space
microwave atomic clocks.
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