Laboratory demonstration of geopotential measurement using transportable optical clocks  

作　　者：刘道信 曹健 袁金波 崔凯枫 袁易 张平 晁思嘉 舒华林 黄学人 Dao-Xin Liu;Jian Cao;Jin-Bo Yuan;Kai-Feng Cui;Yi Yuan;Ping Zhang;Si-Jia Chao;Hua-Lin Shu;Xue-Ren Huang(State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics,Innovation Academy for Precision Measurement Science and Technology,Chinese Academy of Sciences,Wuhan 430071,China;Key Laboratory of Atomic Frequency Standards,Innovation Academy for Precision Measurement Science and Technology,Chinese Academy of Sciences,Wuhan 430071,China;University of the Chinese Academy of Sciences,Beijing 100049,China;Wuhan Institute of Quantum Technology,Wuhan 430206,China)

机构地区：[1]State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics,Innovation Academy for Precision Measurement Science and Technology,Chinese Academy of Sciences,Wuhan 430071,China [2]Key Laboratory of Atomic Frequency Standards,Innovation Academy for Precision Measurement Science and Technology,Chinese Academy of Sciences,Wuhan 430071,China [3]University of the Chinese Academy of Sciences,Beijing 100049,China [4]Wuhan Institute of Quantum Technology,Wuhan 430206,China

出　　处：《Chinese Physics B》2023年第1期272-277,共6页中国物理B（英文版）

基　　金：Project supported by the Basic Frontier Science Research Program of Chinese Academy of Sciences (Grant No.ZDBS-LY-DQC028);the National Key Research and Development Program of China (Grant No.2017YFA0304404);the National Natural Science Foundation of China (Grant No.11674357)。

摘　　要：We report an experimental demonstration of geopotential difference measurement using a pair of transportable ^(40)Ca^(+) optical clocks(TOC-729-1 and TOC-729-3)in the laboratory,each of them has an uncertainty of 1.3×10^(−17) and an instability of 4.8×10^(−15)/√τ.Referenced to a stationary clock of TOC-729-1,the geopotential difference measurements are realized by moving TOC-729-3 to three different locations and the relevant altitude differences are measured with uncertainties at the level of 20 cm.After correcting the systematic shifts(including gravitational red shift),the two-clock frequency difference is measured to be–0.7(2.2)×10^(−17),considering both the statistic(1.0×10^(−17))and the systematic(1.9×10^(−17))uncertainties.The frequency difference between these two clocks is within their respective uncertainties,verifying the reliability of transportable ^(40)Ca^(+) optical clocks at the low level of 10^(−17).

关 键 词：geopotential difference measurement transportable optical clock repeatability evaluation of clocks 

分 类 号：TH714[机械工程—测试计量技术及仪器]