Geopotential measurement with a robust, transportable Ca+ optical clock
| Autor: | Mengyan Zeng, Yanmei Hao, Yuzhuo Wang, Kelin Gao, Baolin Zhang, Huaqing Zhang, Yige Lin, Shiying Cao, Qunfeng Chen, Fang Zhanjun, Yao Huang, Tianchu Li, Kun Liang, Hua Guan, Fang Fang |
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| Rok vydání: | 2020 |
| Předmět: | |
| Zdroj: | Physical Review A. 102 |
| ISSN: | 2469-9934 2469-9926 |
| DOI: | 10.1103/physreva.102.050802 |
| Popis: | We present a robust, transportable ${\mathrm{Ca}}^{+}$ optical clock, with a systematic uncertainty of $1.3\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}17}$ limited by the black-body radiation (BBR) field evaluation and an uptime rate of $g75%$ over a 20-day period. The clock is then installed in an air-conditioned car trailer, making it more convenient for applications. Referenced to a stationary laboratory clock, geopotential measurements are made with the transportable clock with a total uncertainty of 0.33 m (statistically 0.25 m and systematically 0.22 m) and agree with the spirit level measurement. After being moved $g1200$ km, the absolute frequency of the ${\mathrm{Ca}}^{+}$ optical clock transition is measured as 411 042 129 776 400.41(23) Hz, with a fractional uncertainty of $5.6\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}16}$, which is about one order of magnitude smaller than our previous measurement. The transportable built can be used for sub-meter-level elevation measurements, comparing intercontinental optical clocks, verifying basic physical theories, etc. |
| Databáze: | OpenAIRE |
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