High-Accuracy Optical Clock Based on the Octupole Transition in 171Yb+
High-Accuracy Optical Clock Based on the Octupole Transition in 171Yb+
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DOI：
10.1103/physrevlett.108.090801
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发表时间：
2012-02-29
影响因子：
8.6
通讯作者：
Peik, E.
中科院分区：
文献类型：
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作者：
Huntemann, N.;Okhapkin, M.;Peik, E.
我们实验研究了基于单捕获Yb-171（+）离子中467 nm （642 THz）电八极参考跃迁S-2(1/2)（F = 0）—> F-2(7/2)（F = 3）的光学频率标准。这种转变的非凡特征来自于长自然寿命和上层状态的4f(13)6s(2)结构。F-2（7/2）态的电四极矩测量为-0.041(5)ea(0)(2)，其中e为基本电荷，a(0)为玻尔半径。我们还获得了静态极化率的微分标量和张量分量以及探针光诱导的八极跃迁的交流斯塔克位移的信息。通过实时外推方案消除了这种移位，以7.1 x 10（-17）的分数不确定性实现了无扰动的过渡频率。测量频率为642 121 496 772 645.15(52)Hz。
We experimentally investigate an optical frequency standard based on the 467 nm (642 THz) electric-octupole reference transition S-2(1/2)(F = 0) --> F-2(7/2)(F = 3) in a single trapped Yb-171(+) ion. The extraordinary features of this transition result from the long natural lifetime and from the 4f(13)6s(2) configuration of the upper state. The electric-quadrupole moment of the F-2(7/2) state is measured as -0.041(5)ea(0)(2), where e is the elementary charge and a(0) the Bohr radius. We also obtain information on the differential scalar and tensorial components of the static polarizability and of the probe-light-induced ac Stark shift of the octupole transition. With a real-time extrapolation scheme that eliminates this shift, the unperturbed transition frequency is realized with a fractional uncertainty of 7.1 x 10(-17). The frequency is measured as 642 121 496 772 645.15(52) Hz.