论文标题
$ {}^{171} \ mathrm {yb}^+$ single-ion时钟和$ {}^{87} \ mathrm {sr} $ lattice clock的光频率比
Optical frequency ratio of a ${}^{171}\mathrm{Yb}^+$ single-ion clock and a ${}^{87}\mathrm{Sr}$ lattice clock
论文作者
论文摘要
我们报告了642 Thz $ {}^2s_ {1/2}（f = 0）$ - $ {}^2f_ {7/2}（F = 3）$ electry octupole transition in $ {}^{171}^{171} \ mathrm {yb Mathrm {yb Mathrm {Yb}^+$ 42， $ {}^1s_0 $ - $ {}^3p_0 $ transition in $ {}^{87} \ Mathrm {sr} $。在2012年12月至2019年10月之间，在Physikalisch-Technische Bundesanstalt上进行了一系列107次测量。该比率的长期变化比几个$ 10^{-17} $的单个测量不确定性所预期的要大。这些变化的原因仍然未知。即使考虑到这些，我们发现频率比为$ 2.5 \ times 10^{ - 17} $的分数不确定性，该频率比以前的知识提高了一个数量级。平均频率比为$ν_ {\ Mathrm {yb}^+} /ν_ {\ Mathrm {\ Mathrm {sr}} = 1.495 \，991 \，618 \，544 \，900 \，900 \，537（38）$。这代表了迄今为止两个不同的原子物种之间最准确的测量之一。
We report direct measurements of the frequency ratio of the 642 THz ${}^2S_{1/2} (F=0)$--${}^2F_{7/2} (F=3)$ electric octupole transition in ${}^{171}\mathrm{Yb}^+$ and the 429 THz ${}^1S_0$--${}^3P_0$ transition in ${}^{87}\mathrm{Sr}$. A series of 107 measurements has been performed at the Physikalisch-Technische Bundesanstalt between December 2012 and October 2019. Long-term variations of the ratio are larger than expected from the individual measurement uncertainties of few $10^{-17}$. The cause of these variations remains unknown. Even taking these into account, we find a fractional uncertainty of the frequency ratio of $2.5 \times 10^{-17}$, which improves upon previous knowledge by one order of magnitude. The average frequency ratio is $ν_{\mathrm{Yb}^+} / ν_{\mathrm{Sr}} = 1.495\,991\,618\,544\,900\,537(38)$. This represents one of the most accurate measurements between two different atomic species to date.
