$^{171}$Yb 光晶格钟 NMIJ-Yb1 的系统不确定度评估改进，不确定度为 $2.6\ imes10^{-17}$
Improved systematic uncertainty evaluation of the $^{171}$Yb optical lattice clock NMIJ-Yb1 with uncertainty of $2.6\times10^{-17}$
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中文总结 AI 辅助
该研究评估了 $^{171}$Yb 光晶格钟 NMIJ-Yb1 的系统不确定度，通过浅晶格边带冷却和真空内测温将总不确定度降至 $2.6\ imes10^{-17}$，并实现 91.3% 的连续运行，为国际原子时校准改进提供潜力。
中文摘要 AI 辅助
我们报告了 $^{171}$Yb 光晶格钟 NMIJ-Yb1（NMIJ：日本国家计量院）的系统不确定度评估，其分数频率不确定度为 $2.6\ imes10^{-17}$，与之前的不确定度相比提高了 3.8 倍。通过在浅光晶格中制备轴向边带冷却原子，晶格光频移的不确定度降低至 $1.6\ imes10^{-17}$。我们比较了计算晶格光频移的不同模型，考虑了由于处理光晶格中俘获原子的径向运动而可能产生的模型依赖偏差。通过使用真空内温度传感器测量原子位置处的辐射温度，黑体辐射频移的不确定度达到 $7.0\ imes10^{-18}$。我们还演示了 NMIJ-Yb1 近乎连续运行，10 天内运行时间占比为 91.3%，显示了未来改进国际原子时校准不确定度的潜力。
英文摘要
We report a systematic uncertainty evaluation of the $^{171}$Yb optical lattice clock NMIJ-Yb1 (NMIJ: National Metrology Institute of Japan) with a fractional frequency uncertainty of $2.6\times10^{-17}$, improved by a factor of 3.8 compared with our previous uncertainty. The uncertainty of the lattice light shift is reduced to $1.6\times10^{-17}$ by preparing axially sideband-cooled atoms in a shallow optical lattice. Different models to calculate the lattice light shift are compared, taking account of possible model-dependent biases due to the treatment of the radial motion of atoms trapped in the optical lattice. The uncertainty of the blackbody radiation shift reaches $7.0\times10^{-18}$ by measuring the radiative temperature at the position of atoms with an in-vacuum temperature sensor. We also demonstrate the nearly continuous operation of NMIJ-Yb1 with an uptime of 91.3 $\%$ for 10 days, showing the potential for future improvement of the calibration uncertainty of International Atomic Time.
发表机构
- National Metrology Institute of Japan (NMIJ), National Institute of Advanced Industrial Science and Technology (AIST)（日本国家计量院（NMIJ），产业技术综合研究所（AIST））
- Department of Physics, Graduate School of Engineering Science, Yokohama National University（横滨国立大学工学研究科物理系）
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