期刊
METROLOGIA
卷 57, 期 6, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1681-7575/ab9f1f
关键词
optical lattice clock; SI second; frequency metrology
资金
- Japan Society for the Promotion of Science (JSPS) KAKENHI [17H01151, 17K14367]
- JST-Mirai Program, Japan [JPMJMI18A1]
- Grants-in-Aid for Scientific Research [17K14367, 17H01151] Funding Source: KAKEN
Optical lattice clocks surpass primary Cs microwave clocks in frequency stability and accuracy, and are promising candidates for a redefinition of the second in the International System of Units (SI). However, the robustness of optical lattice clocks has not yet reached a level comparable to that of Cs fountain clocks which contribute to International Atomic Time (TAI) by the nearly continuous operation. In this paper, we report the long-term operation of an Yb-171 optical lattice clock with a coverage of 80.3% for half a year including uptimes of 93.9% for the first 24 days and 92.6% for the last 35 days. This enables a nearly dead-time-free frequency comparison of the optical lattice clock with TAI over months, which provides a link to the SI second with an uncertainty of low 10(-16). By using this link, the absolute frequency of the (1)S0-3
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