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28 March 2024
 
  » arxiv » 2203.11272

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113 km Free-Space Time-Frequency Dissemination at the 19th Decimal Instability
Qi Shen ; Jian-Yu Guan ; Ji-Gang Ren ; Ting Zeng ; Lei Hou ; Min Li ; Yuan Cao ; Jin-Jian Han ; Meng-Zhe Lian ; Yan-Wei Chen ; Xin-Xin Peng ; Shao-Mao Wang ; Dan-Yang Zhu ; Xi-Ping Shi ; Zheng-Guo Wang ; Ye Li ; Wei-Yue Liu ; Ge-Sheng Pan ; Yong Wang ; Zhao-Hui Li ; Jin-Cai Wu ; Yan-Yan Zhang ; Fa-Xi Chen ; Chao-Yang Lu ; Sheng-Kai Liao ; Juan Yin ; Jian-Jun Jia ; Cheng-Zhi Peng ; Hai-Feng Jiang ; Qiang Zhang ; Jian-Wei Pan ;
Date 22 Mar 2022
AbstractOptical clock networks play important roles in various fields, such as precise navigation, redefinition of "second" unit, and gravitational tests. To establish a global-scale optical clock network, it is essential to disseminate time and frequency with a stability of $10^{-19}$ over a long-distance free-space link. However, such attempts were limited to dozens of kilometers in mirror-folded configuration. Here, we take a crucial step toward future satellite-based time-frequency disseminations. By developing the key technologies, including high-power frequency combs, high-stability and high-efficiency optical transceiver systems, and efficient linear optical sampling, we demonstrate free-space time-frequency dissemination over two independent links with femtosecond time deviation, $3 imes10^{-19}$ at 10,000 s residual instability and $1.6 imes10^{-20}pm 4.3 imes10^{-19}$ offset. This level of the stability retains for an increased channel loss up to 89 dB. Our work can not only be directly used in ground-based application, but also firmly laid the groundwork for future satellite time-frequency dissemination.
Source arXiv, 2203.11272
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