Frequency Ratio of 199Hg and 87Sr Optical Lattice Clocks beyond the SI Limit

被引:92
作者
Yamanaka, Kazuhiro [1 ,2 ,3 ]
Ohmae, Noriaki [1 ,2 ,3 ]
Ushijima, Ichiro [1 ,2 ]
Takamoto, Masao [1 ,2 ]
Katori, Hidetoshi [1 ,2 ,3 ]
机构
[1] RIKEN, Quantum Metrol Lab, Wako, Saitama 3510198, Japan
[2] JST, ERATO, Innovat Space Time Project, Bunkyo Ku, Tokyo 1138656, Japan
[3] Univ Tokyo, Grad Sch Engn, Dept Appl Phys, Bunkyo Ku, Tokyo 1138656, Japan
关键词
STABILITY;
D O I
10.1103/PhysRevLett.114.230801
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
We report on a frequency ratio measurement of a Hg-199-based optical lattice clock referencing a Sr-87-based clock. Evaluations of lattice light shift, including atomic-motion-dependent shift, enable us to achieve a total systematic uncertainty of 7.2 x 10(-17) for the Hg clock. The frequency ratio is measured to be upsilon(Hg)/upsilon(Sr) = 2.629 314 209 898 909 60 (22) with a fractional uncertainty of 8.4 x 10(-17), which is smaller than the uncertainty of the realization of the International System of Units (SI) second, i.e., the SI limit.
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页数:5
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