Improved absolute frequency measurement of $^{171}$Yb at NMIJ with uncertainty below $2\times10^{-16}$
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| Main Authors: | , , , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866910845851664384 |
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| author | Kobayashi, Takumi Nishiyama, Akiko Hosaka, Kazumoto Akamatsu, Daisuke Kawasaki, Akio Wada, Masato Inaba, Hajime Tanabe, Takehiko Yasuda, Masami |
| author_facet | Kobayashi, Takumi Nishiyama, Akiko Hosaka, Kazumoto Akamatsu, Daisuke Kawasaki, Akio Wada, Masato Inaba, Hajime Tanabe, Takehiko Yasuda, Masami |
| contents | We report improved absolute frequency measurement of the $^{1}$S$_{0}-^{3}$P$_{0}$ transition of $^{171}$Yb at National Metrology Institute of Japan (NMIJ) by comparing the $^{171}$Yb optical lattice clock NMIJ-Yb1 with 13 Cs primary frequency standards via International Atomic Time from August 2021 to May 2023. The measured absolute frequency is 518 295 836 590 863.62(10) Hz with a fractional uncertainty of $1.9\times10^{-16}$, in good agreement with the recommended frequency of $^{171}$Yb as a secondary representation of the second. This uncertainty is 2.6 times lower than our previous measurement uncertainty, and slightly lower than any uncertainties of the absolute frequency measurements of $^{171}$Yb that have so far been reported by other institutes. We also estimate correlation coefficients between our present and previous measurements, which is important for updating the recommended frequency. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2502_18914 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Improved absolute frequency measurement of $^{171}$Yb at NMIJ with uncertainty below $2\times10^{-16}$ Kobayashi, Takumi Nishiyama, Akiko Hosaka, Kazumoto Akamatsu, Daisuke Kawasaki, Akio Wada, Masato Inaba, Hajime Tanabe, Takehiko Yasuda, Masami Atomic Physics We report improved absolute frequency measurement of the $^{1}$S$_{0}-^{3}$P$_{0}$ transition of $^{171}$Yb at National Metrology Institute of Japan (NMIJ) by comparing the $^{171}$Yb optical lattice clock NMIJ-Yb1 with 13 Cs primary frequency standards via International Atomic Time from August 2021 to May 2023. The measured absolute frequency is 518 295 836 590 863.62(10) Hz with a fractional uncertainty of $1.9\times10^{-16}$, in good agreement with the recommended frequency of $^{171}$Yb as a secondary representation of the second. This uncertainty is 2.6 times lower than our previous measurement uncertainty, and slightly lower than any uncertainties of the absolute frequency measurements of $^{171}$Yb that have so far been reported by other institutes. We also estimate correlation coefficients between our present and previous measurements, which is important for updating the recommended frequency. |
| title | Improved absolute frequency measurement of $^{171}$Yb at NMIJ with uncertainty below $2\times10^{-16}$ |
| topic | Atomic Physics |
| url | https://arxiv.org/abs/2502.18914 |