Evaluation of systematic uncertainty for transportable Sr-87 optical lattice clock

doi:10.7498/aps.70.20201204

	Evaluation of systematic uncertainty for transportable Sr-87 optical lattice clock
	Kong De-Huan 1,2; Guo Feng 1,2; Li Ting 1,2; Lu Xiao-Tong 1,2; Wang Ye-Bing 2; Chang Hong 1,2
刊名	ACTA PHYSICA SINICA
	2021-02-05
卷号	70 期号:3 页码:9
关键词	transportable Sr-87 optical lattice clock systematic shift uncertainty time-interleaved self-comparison method
ISSN号	1000-3290
DOI	10.7498/aps.70.20201204
英文摘要	Transportable optical clocks have broad applications in scientific research and engineering. Accurate evaluation of systematic uncertainty for the transportable Sr-87 optical lattice clock is a prerequisite for the practical realization of the optical clock. Four main frequency shifts of the Sr-87 optical lattice clock are measured, i.e. blackbody-radiation (BBR) shift, collision shift, lattice alternating current (AC) Stark shift, and second-order Zeeman shift. Firstly, by measuring the temperature distribution on the surface of the magnetooptical trap cavity and analyzing the influence of different heat sources on atomic cloud, the BBR shift correction is measured to be 50.4 x 10(-16) Hz with an uncertainty of 5.1 x 10(-17). Secondly, the time-interleaved self-comparison method is used under high and low atom density condition to evaluate the collision shift of the system. The correction of collision shift is 4.7 x 10(-16) with an uncertainty of 5.6 x 10(-17). Thirdly, the lattice AC Stark shift is evaluated by the time-interleaved self-comparison method. By measuring the dependence of the lattice AC Stark shift on the wavelength of the lattice light, the magic wavelength is measured to be 368554393(78) MHz. As a result, the lattice AC Stark shift correction is 3.0 x 10(-16) with an uncertainty of 2.2 x 10(-16) . Finally, using the time-interleaved self-comparison technology, the second-order Zeeman frequency shift is evaluated by measuring the fluctuation of the difference in center frequency between the m(F) = +9/2 -> m(F) = +9/2 polarization spectrum and m(F) = -9/2 -> m(F) = -9/2 polarization spectrum. The correction of secondorder Zeeman shift is calculated to be 0.7 x 10(-16), and corresponding uncertainty is 0.2 x 10(-17). Experimental results indicate that the frequency shift correction due to the blackbody radiation is the largest, while the uncertainty caused by the lattice AC Stark effect is the largest in the evaluated shifts. The systematic shift is 58.8 x 10(-16), the total uncertainty is 2.3 x 10(-16). In the next work, the magneto-optical trap cavity will be placed in a blackbody-radiation cavity to reduce the blackbody-radiation shift. The uncertainty of the collision shift will be reduced by increasing the beam waist of the lattice and reducing the potential well depth of the lattice, which will reduce the density of atoms. What is more, the light source for the optical lattice after spectral filtering will be measured by an optical frequency comb locked to the hydrogen clock signal to reduce the uncertainty of the lattice AC Stark frequency shift. The systematic uncertainty is expected to be on the order of 10(-17). The evaluation of the systematic uncertainty for the transportable Sr-87 optical lattice clock lays the foundation for the practical application.
资助项目	National Natural Science Foundation of China[61775220] ; National Natural Science Foundation of China[11803042] ; Key Research Project of Frontier Science of the Chinese Academy of Sciences[QYZBD-SSW-JSC004] ; Youth Innovation Promotion Association CAS[2019400]
WOS关键词	STABILITY ; ACCURACY
WOS研究方向	Physics
语种	英语
出版者	CHINESE PHYSICAL SOC
WOS记录号	WOS:000616120300004
资助机构	National Natural Science Foundation of China ; National Natural Science Foundation of China ; Key Research Project of Frontier Science of the Chinese Academy of Sciences ; Key Research Project of Frontier Science of the Chinese Academy of Sciences ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Key Research Project of Frontier Science of the Chinese Academy of Sciences ; Key Research Project of Frontier Science of the Chinese Academy of Sciences ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Key Research Project of Frontier Science of the Chinese Academy of Sciences ; Key Research Project of Frontier Science of the Chinese Academy of Sciences ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Key Research Project of Frontier Science of the Chinese Academy of Sciences ; Key Research Project of Frontier Science of the Chinese Academy of Sciences ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS
内容类型	期刊论文
源URL	[http://210.72.145.45/handle/361003/12148]
专题	中国科学院国家授时中心
通讯作者	Wang Ye-Bing; Chang Hong
作者单位	1.Univ Chinese Acad Sci, Sch Astron & Space Sci, Beijing 100049, Peoples R China 2.Natl Time Serv Ctr, CAS Key Lab Time & Frequency Primary Stand, Xian 710600, Peoples R China
推荐引用方式 GB/T 7714	Kong De-Huan,Guo Feng,Li Ting,et al. Evaluation of systematic uncertainty for transportable Sr-87 optical lattice clock[J]. ACTA PHYSICA SINICA,2021,70(3):9.
APA	Kong De-Huan,Guo Feng,Li Ting,Lu Xiao-Tong,Wang Ye-Bing,&Chang Hong.(2021).Evaluation of systematic uncertainty for transportable Sr-87 optical lattice clock.ACTA PHYSICA SINICA,70(3),9.
MLA	Kong De-Huan,et al."Evaluation of systematic uncertainty for transportable Sr-87 optical lattice clock".ACTA PHYSICA SINICA 70.3(2021):9.