论文标题
$^{171} $ yb光学晶格时钟的几乎连续操作的演示半年
Demonstration of the nearly continuous operation of an $^{171}$Yb optical lattice clock for half a year
论文作者
论文摘要
光学晶格时钟在频率稳定性和准确性上超过主要CS微波钟，并且是在国际单位系统（SI）中重新定义第二个的候选人。但是，光学晶格时钟的鲁棒性尚未达到与CS喷泉时钟相当的水平，而CS喷泉时钟却几乎连续运行促成了国际原子能时间（TAI）。在本文中，我们报告了$^{171} $ yb光学晶格时钟的长期操作，半年的覆盖率为80.3％，其中包括前24天的上升时间为93.9％，在过去的35天中为92.6％。这使得在几个月内使用TAI的光学晶格时钟进行了几乎无时间的频率比较，这提供了与Si Second的链接，并具有低$ 10^{ - 16} $的不确定性。通过使用此链接，$^{1} $ s $ _ {0} - ^{3} $ p $ _ {0} $ p $ _ {0} $时钟过渡的$^{171} $ yb的绝对频率被测量为518 295 295 836 590 860 863.54（26）hz，其flactional Infactional Infactional Infactional Infcractional Infcrientity of $ 5.50}该值与$^{171} $ yb的建议频率一致，作为第二个的次要表示。
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 $^{171}$Yb 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 $^{1}$S$_{0}-^{3}$P$_{0}$ clock transition of $^{171}$Yb is measured as 518 295 836 590 863.54(26) Hz with a fractional uncertainty of $5.0\times10^{-16}$. This value is in agreement with the recommended frequency of $^{171}$Yb as a secondary representation of the second.
