We report a measurement of the absolute frequency of the ¹S₀–³P₀ transition in the ¹⁷¹Yb optical lattice clock at KRISS (KRISS-Yb1) for 14 months, which was referenced to the SI second by primary and secondary standards worldwide via International Atomic Time. The determined absolute frequency is 518 295 836 590 863.75(14) Hz with the relative frequency uncertainty of 2.6 10⁻¹⁶, which agrees well with other reports. This result is expected to contribute to the future update of the CIPM recommendation frequency of the secondary frequency standards.

中文翻译：

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在 KRISS 使用 TAI 对 171Yb 光学晶格时钟进行了一年多的绝对频率测量

我们报告了14 个月内 KRISS (KRISS-Yb1)的¹⁷¹ Yb 光学晶格时钟中¹ S ₀ – ³ P ₀跃迁的绝对频率的测量值，全球主要和次要标准参考了 SI 秒，通过国际原子时。确定的绝对频率为 518 295 836 590 863.75(14) Hz，相对频率不确定度为 2.6 10 ^-16，这与其他报告非常吻合。该结果预计将有助于未来更新二级频率标准的 CIPM 推荐频率。