Rapid progress in optical atomic clock performance has advanced the frontiers of
timekee**, metrology and quantum science,–. Despite considerable efforts, the …

This paper outlines the roadmap towards the redefinition of the second, which was recently
updated by the CCTF Task Force created by the CCTF in 2020. The main achievements of …

Laser cooled atoms have proven transformative for precision metrology, playing a pivotal
role in state-of-the-art clocks and interferometers and having the potential to provide a step …

This paper gives a detailed account of the analysis underpinning the 2021 update to the list
of standard reference frequency values recommended by the International Committee for …

Narrow optical resonances of atoms or molecules have immense significance in various
precision measurements, such as testing fundamental physics and the generation of primary …

Absolute frequency measurements with a robust, transportable 40Ca+ optical clock - IOPscience
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Providing phase stable laser light is important to extend the interrogation time of optical
clocks towards many seconds and thus achieve small statistical uncertainties. We report a …

摘要光钟在**20 年里发展迅速, 稳定度和系统不确定度均比当前最好的微波原子钟高出两个量
级, 目前已有10 个光学跃迁被国际计量局选定为二级秒定义并参与原子时的产生 …

We report a long-term frequency-stabilized optical frequency comb at 530–1100 nm based
on a turnkey Ti: sapphire mode-locked laser. With the help of a digital controller, turnkey …

Abstract The International System of Units (SI) definition of the'second'is likely to be
redefined in the optical frequency region in the near future. Therefore, uncertainty reduction …