Progress on the 40Ca+ ion optical clock

doi:10.1088/1674-1056/ab9432

Abstract Progress of the ⁴⁰Ca⁺ ion optical clock based on the 4²S_1/2-3d ²D_5/2 electric quadrupole transition is reported. By setting the drive frequency to the “magic” frequency Ω₀, the frequency uncertainty caused by the scalar Stark shift and second-order Doppler shift induced by micromotion is reduced to the 10^-19 level. By precisely measuring the differential static scalar polarizability △α₀, the uncertainty due to the blackbody radiation (BBR) shift (coefficient) is reduced to the 10^-19 level. With the help of a second-order integrating servo algorithm, the uncertainty due to the servo error is reduced to the 10^-18 level. The total fractional uncertainty of the ⁴⁰Ca⁺ ion optical clock is then improved to 2.2×10^-17, whereas this value is mainly restricted by the uncertainty of the BBR shift due to temperature fluctuations. The state preparation is introduced together with improvements in the pulse sequence, and furthermore, a better signal to noise ratio (SNR) and less dead time are achieved. The clock stability of a single clock is improved to 4.8×10^-15/√τ (in seconds).

Keywords: ⁴⁰Ca⁺ ion optical clocks “magic” drive frequency frequency uncertainty frequency stability

Received: 16 March 2020
Revised: 18 May 2020
Accepted manuscript online:

PACS:	42.62.Fi	(Laser spectroscopy)
	37.10.Ty	(Ion trapping)
	95.55.Sh	(Auxiliary and recording instruments; clocks and frequency standards)
	06.20.-f	(Metrology)

Fund: Project supported by the National Key Research and Development Program of China (Grant Nos. 2017YFA0304401, 2018YFA0307500, 2017YFA0304404, and 2017YFF0212003), the National Natural Science Foundation of China (Grant Nos. 11622434, 11774388, 11634013, 11934014, and 91736310), the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDB21030100), the CAS Youth Innovation Promotion Association (Grant Nos. Y201963 and 2018364), and the Science Fund for Distinguished Young Scholars of Hubei Province, China (Grant No. 2017CFA040).

Corresponding Authors: Hua Guan, Kelin Gao
E-mail: guanhua@wipm.ac.cn;klgao@wipm.ac.cn

Cite this article:

Baolin Zhang(张宝林), Yao Huang(黄垚), Huaqing Zhang(张华青), Yanmei Hao(郝艳梅), Mengyan Zeng(曾孟彦), Hua Guan(管桦), Kelin Gao(高克林) Progress on the ⁴⁰Ca⁺ ion optical clock 2020 Chin. Phys. B 29 074209

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Progress on the 40Ca+ ion optical clock

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Progress on the ⁴⁰Ca⁺ ion optical clock