88Sr+ 445-THz single-ion reference at the 10(-17) level via control and cancellation of systematic uncertainties and its measurement against the SI second.
88Sr+ 445-THz single-ion reference at the 10(-17) level via control and cancellation of systematic uncertainties and its measurement against the SI second.
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DOI：
10.1103/physrevlett.109.203002
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发表时间：
2012-11
影响因子：
8.6
通讯作者：
A. Madej;P. Dubé;Zichao Zhou;J. Bernard;M. Gertsvolf
中科院分区：
文献类型：
--
作者：
A. Madej;P. Dubé;Zichao Zhou;J. Bernard;M. Gertsvolf
我们描述了对捕获和激光冷却的（88）Sr（+）单离子的实验和测量，当在445太赫兹下对其参考5s (2)S（1/2）→4d (2)D（5/2）跃迁进行探测时，提供了评估精度优于当前实现的SI秒的光学频率标准。研究表明，微运动相关的标准位移可以降低到10（-18）级，而由于锶离子体系的相对众所周知的极化性和陷阱结构的精心选择，当前系统的黑体诱导位移的不确定性处于低10（-17）级。目前评估的离子跃迁的系统位移的分数不确定度为2×10（-17）。在两个月的时间里，通过全球定位系统时间转换，相对于一个以SI秒为基准的脉泽进行了绝对频率测量，确定了ν(SD)=444 779 044 095 485.5±0.9 Hz （1σ）的中心频率。
We describe experiments and measurements on a trapped and laser-cooled single ion of (88)Sr(+) which, when probed on its reference 5s (2)S(1/2)→4d (2)D(5/2) transition at 445 THz, provides an optical frequency standard of evaluated accuracy outperforming the current realization of the SI second. Studies are presented showing that micromotion-associated shifts of the standard can be reduced to the 10(-18) level and uncertainties in the blackbody-induced shifts for the current system are at the low 10(-17) level due to the relatively well-known polarizability of the strontium ion system and careful choice of the trap structure. The current evaluated systematic shifts for the ion transition are at a fractional uncertainty of 2×10(-17). An absolute frequency measurement performed over a two-month period relative to a maser referenced to the SI second via Global Positioning System time transfer has determined the center frequency for the transition at ν(SD)=444 779 044 095 485.5±0.9 Hz (1σ).