Hertz-level measurement of the Ca-40(+) 4s S-2(1/2)-3d D-2(5/2) clock transition frequency with respect to the SI second through the Global Positioning System
Hertz-level measurement of the Ca-40(+) 4s S-2(1/2)-3d D-2(5/2) clock transition frequency with respect to the SI second through the Global Positioning System
复制标题
通过全球定位系统对 Ca-40( ) 4s S-2(1/2)-3d D-2(5/2) 时钟转换频率相对于 SI 秒进行赫兹级测量
DOI：
10.1103/physreva.85.030503
复制
发表时间：
2011-11
影响因子：
2.9
通讯作者：
Gao, K.
中科院分区：
文献类型：
--
作者：
Guan, H.;Huang, X.;Li, T.;Gao, K.
我们在微型Paul阱中测量了激光冷却的Ca-40（+）离子在10（-15）能级上的时钟跃迁的绝对频率。在我们的测量中，光学频率梳参考氢脉泽，这是通过全球定位系统（GPS）校准到SI秒。通过分析32天内总平均时间> 2 × 10（6）s的实验数据，测得Ca-40（+）4s S-2（1/2）-3d D-2（5/2）时钟跃迁的绝对频率为411 042 129 776 393.0（1.6）Hz，分数不确定度为3.9 × 10（-15）。
We have measured the absolute frequency of a clock transition at the 10(-15) level with a single, trapped, laser-cooled Ca-40(+) ion in a miniature Paul trap. In our measurement, an optical frequency comb is referenced to a hydrogen maser, which is calibrated to the SI second through the Global Positioning System (GPS). By analyzing the experimental data obtained within 32 days of a total averaging time > 2 x 10(6) s, the absolute frequency of the Ca-40(+) 4s S-2(1/2)-3d D-2(5/2) clock transition is measured as 411 042 129 776 393.0 (1.6) Hz with a fractional uncertainty of 3.9 x 10(-15).