Atomic Clock with 1 x 10-18 Room-Temperature Blackbody Stark Uncertainty
Atomic Clock with 1 x 10-18 Room-Temperature Blackbody Stark Uncertainty
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DOI：
10.1103/physrevlett.113.260801
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发表时间：
2014-12-24
影响因子：
8.6
通讯作者：
Ludlow, A. D.
中科院分区：
文献类型：
--
作者：
Beloy, K.;Hinkley, N.;Ludlow, A. D.
由于黑体辐射（BBR）的斯塔克位移是限制许多原子频率标准的性能的关键因素，与BBR环境内的时钟装置是难以在高精度水平的特征。在这里，我们展示了一个真空辐射屏蔽，它为镱光晶格钟中的原子提供了一个均匀的、特征良好的BBR环境。在室温下工作时，该屏蔽可将BBR环境的规格设定为5.5 x 10（-19）的相应分数时钟不确定度贡献。结合原子响应的不确定性，BBR斯塔克位移的总不确定性现在是1 × 10（-18）。屏蔽在高温下的进一步操作使得能够直接测量BBR移位温度依赖性，并证明我们评估的BBR环境和预期的原子响应之间的一致性。
The Stark shift due to blackbody radiation (BBR) is the key factor limiting the performance of many atomic frequency standards, with the BBR environment inside the clock apparatus being difficult to characterize at a high level of precision. Here we demonstrate an in-vacuum radiation shield that furnishes a uniform, well-characterized BBR environment for the atoms in an ytterbium optical lattice clock. Operated at room temperature, this shield enables specification of the BBR environment to a corresponding fractional clock uncertainty contribution of 5.5 x 10(-19). Combined with uncertainty in the atomic response, the total uncertainty of the BBR Stark shift is now 1 x 10(-18). Further operation of the shield at elevated temperatures enables a direct measure of the BBR shift temperature dependence and demonstrates consistency between our evaluated BBR environment and the expected atomic response.