中国物理B ›› 2023, Vol. 32 ›› Issue (1): 10601-010601.doi: 10.1088/1674-1056/ac6337

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Laboratory demonstration of geopotential measurement using transportable optical clocks

Dao-Xin Liu(刘道信)1,2,3, Jian Cao(曹健)1,2,†, Jin-Bo Yuan(袁金波)1,2, Kai-Feng Cui(崔凯枫)1,2, Yi Yuan(袁易)1,2,3, Ping Zhang(张平)1,2,3, Si-Jia Chao(晁思嘉)1,2, Hua-Lin Shu(舒华林)1,2, and Xue-Ren Huang(黄学人)1,2,4,‡   

  1. 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
  • 收稿日期:2022-01-26 修回日期:2022-03-29 接受日期:2022-04-01 出版日期:2022-12-08 发布日期:2022-12-08
  • 通讯作者: Jian Cao, Xue-Ren Huang E-mail:caojian@apm.ac.cn;hxueren@apm.ac.cn
  • 基金资助:
    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), and the National Natural Science Foundation of China (Grant No. 11674357).

Laboratory demonstration of geopotential measurement using transportable optical clocks

Dao-Xin Liu(刘道信)1,2,3, Jian Cao(曹健)1,2,†, Jin-Bo Yuan(袁金波)1,2, Kai-Feng Cui(崔凯枫)1,2, Yi Yuan(袁易)1,2,3, Ping Zhang(张平)1,2,3, Si-Jia Chao(晁思嘉)1,2, Hua-Lin Shu(舒华林)1,2, and Xue-Ren Huang(黄学人)1,2,4,‡   

  1. 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
  • Received:2022-01-26 Revised:2022-03-29 Accepted:2022-04-01 Online:2022-12-08 Published:2022-12-08
  • Contact: Jian Cao, Xue-Ren Huang E-mail:caojian@apm.ac.cn;hxueren@apm.ac.cn
  • Supported by:
    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), and 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 $1.3 \times 10^{-17}$ and an instability of $4.8 \times 10^{-15}/\sqrt{ \tau } $. 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 $-0.7(2.2) \times 10^{-17}$, considering both the statistic $(1.0 \times 10^{-17})$ and the systematic $(1.9 \times 10^{-17})$ 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

Abstract: 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 $1.3 \times 10^{-17}$ and an instability of $4.8 \times 10^{-15}/\sqrt{ \tau } $. 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 $-0.7(2.2) \times 10^{-17}$, considering both the statistic $(1.0 \times 10^{-17})$ and the systematic $(1.9 \times 10^{-17})$ 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$^{-17}$.

Key words: geopotential difference measurement, transportable optical clock, repeatability evaluation of clocks

中图分类号:  (Time and frequency)

  • 06.30.Ft
37.10.Ty (Ion trapping) 37.10.Rs (Ion cooling) 04.20.-q (Classical general relativity)