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NTSC SrII optical lattice clock with uncertainty of 2 × 10 − 18
Xiaotong Lu (Chinese Academy of Sciences, National Time Service Center), Feng Guo (Chinese Academy of Sciences, National Time Service Center), Yanyan Liu (Chinese Academy of Sciences, National Time Service Center), Jin Cao (Chinese Academy of Sciences, National Time Service Center), Jiaan Li (Chinese Academy of Sciences, National Time Service Center), Jingjing Xia (University of Science and Technology of China, Chinese Academy of Sciences), Qinfang Xu (Chinese Academy of Sciences, National Time Service Center), Benquan Lu (Chinese Academy of Sciences, National Time Service Center), Yebing Wang (University of Science and Technology of China, Chinese Academy of Sciences), Hong Chang (University of Science and Technology of China, Chinese Academy of Sciences)
Abstract: Abstract We report the systematic evaluation of the SrII optical lattice clock (OLC) at the National Time Service Center, achieving an uncertainty of 1.96 × 10 − 18 . The newly established 87 Sr OLC controls the black-body radiation shift by moving atoms into a temperature-stabilized chamber for clock transition detection. It mitigates the DC Stark shift by using conductive optical films on the inner windows, and reduces both the density shift and AC Stark shift by operating the clock with a relatively low lattice trap depth. Additionally, this clock accommodates changes in the angle between the lattice and gravity directions by rotating the entire setup, allowing for convenient adjustment of the tunneling effect in the shallow lattice.