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Chin. Phys. B, 2021, Vol. 30(1): 013701    DOI: 10.1088/1674-1056/abbbee
Special Issue: SPECIAL TOPIC — Ultracold atom and its application in precision measurement
TOPICAL REVIEW—Ultracold atom and its application in precision measurement Prev   Next  

Cold atom clocks and their applications in precision measurements

Shao-Yang Dai(戴少阳)1, Fa-Song Zheng(郑发松)1,2, Kun Liu(刘昆)1, Wei-Liang Chen(陈伟亮)1, Yi-Ge Lin(林弋戈), Tian-Chu Li(李天初)1, and Fang Fang(房芳)1,
1 National Institute of Metrology (NIM), Beijing 100029, China; 2 The State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision Instrument, Tsinghua University, Beijing 100084, China
Abstract  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.
Keywords:  atomic fountain clock      optical clock  
Revised:  17 August 2020      Published:  30 December 2020
PACS:  37.10.Jk (Atoms in optical lattices)  
  37.10.-x (Atom, molecule, and ion cooling methods)  
  95.55.Sh (Auxiliary and recording instruments; clocks and frequency standards)  
Fund: 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), and Consulting Research Project of Chinese Academy of Engineering (Grant No. 2018-ZCQ-03).
Corresponding Authors:  Corresponding author. E-mail: fangf@nim.ac.cn   

Cite this article: 

Shao-Yang Dai(戴少阳), Fa-Song Zheng(郑发松), Kun Liu(刘昆), Wei-Liang Chen(陈伟亮), Yi-Ge Lin(林弋戈), Tian-Chu Li(李天初), and Fang Fang(房芳) Cold atom clocks and their applications in precision measurements 2021 Chin. Phys. B 30 013701

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