Geopotential measurement with a robust, transportable Ca+ optical clock
Geopotential measurement with a robust, transportable Ca+ optical clock
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使用坚固、可移动的 Ca 光学时钟进行位势测量
DOI：
10.1103/physreva.102.050802
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发表时间：
2020-11-18
影响因子：
2.9
通讯作者：
Gao, Kelin
中科院分区：
文献类型：
--
作者：
Huang, Yao;Zhang, Huaqing;Gao, Kelin
我们提出了一个强大的，可移动的Ca+光学时钟，系统的不确定度为1.3 × 10（-17）限制的黑体辐射（BBR）领域的评估和一个超过75%，在20天的时间内。然后将时钟安装在装有空调的汽车拖车中，使其更方便应用。参考固定的实验室时钟，使用总不确定度为0.33 m（统计上为0.25 m，系统上为0.22 m）的可移动时钟进行地球位测量，并与水准仪测量结果一致。在移动>1200 km后，测量到Ca+光钟跃迁的绝对频率为411 042 129 776 400.41（23）Hz，分数不确定度为5.6 × 10（-16），比我们以前的测量小了一个数量级。建造的可移动式可用于亚米级高程测量，比较洲际光学时钟，验证基本物理理论等。
We present a robust, transportable Ca+ optical clock, with a systematic uncertainty of 1.3 x 10(-17) limited by the black-body radiation (BBR) field evaluation and an uptime rate of >75% over a 20-day period. The clock is then installed in an air-conditioned car trailer, making it more convenient for applications. Referenced to a stationary laboratory clock, geopotential measurements are made with the transportable clock with a total uncertainty of 0.33 m (statistically 0.25 m and systematically 0.22 m) and agree with the spirit level measurement. After being moved >1200 km, the absolute frequency of the Ca+ optical clock transition is measured as 411 042 129 776 400.41(23) Hz, with a fractional uncertainty of 5.6 x 10(-16), which is about one order of magnitude smaller than our previous measurement. The transportable built can be used for sub-meter-level elevation measurements, comparing intercontinental optical clocks, verifying basic physical theories, etc.