摘要
Cold atom clocks have made remarkable progresses in the last two decades and played critical roles in precision measurements. Primary Cs fountain frequency standards have achieved a total uncertainty of a few parts in 1016, and the best optical clock has reached a type B uncertainty below 10-18. Besides applications in the metrology, navigation, etc.,ultra-stable and ultra-accurate atomic clocks have also become powerful tools in the basic scientific investigations. In this paper, we focus on the recent developments in the high-performance cold atomic clocks which can be used as frequency standards to calibrate atomic time scales. The basic principles, performances, and limitations of fountain clocks and optical clocks based on signal trapped ion or neutral atoms are summarized. Their applications in metrology and other areas are briefly introduced.
作者
戴少阳
郑发松
刘昆
陈伟亮
林弋戈
李天初
房芳
Shao-Yang Dai;Fa-Song Zheng;Kun Liu;Wei-Liang Chen;Yi-Ge Lin;Tian-Chu Li;Fang Fang(National Institute of Metrology(NIM),Beijing 100029,China;The State Key Laboratory of Precision Measurement Technology and Instruments,Department of Precision Instrument,Tsinghua University,Beijing 100084,China)
基金
Project supported by the National Natural Science Foundation of China(Grant No.11873044)
the National Key Research and Development Project of China(Grant No.2016YFF0200202)
Consulting Research Project of Chinese Academy of Engineering(Grant No.2018-ZCQ-03)。