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Chin. Phys. B, 2014, Vol. 23(3): 030601    DOI: 10.1088/1674-1056/23/3/030601
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Review of chip-scale atomic clocks based on coherent population trapping

Wang Zhong
School of Electronics Engineering & Computer Science (EECS), Peking University, Beijing 100871, China
Abstract  Research on chip-scale atomic clocks (CSACs) based on coherent population trapping (CPT) is reviewed. The background and the inspiration for the research are described, including the important schemes proposed to improve the CPT signal quality, the selection of atoms and buffer gases, and the development of micro-cell fabrication. With regard to the reliability,stability, and service life of the CSACs, the research regarding the sensitivity of the CPT resonance to temperature and laser power changes is also reviewed, as well as the CPT resonance’s collision and light of frequency shifts. The first generation CSACs have already been developed but its characters are still far from our expectations. Our conclusion is that miniaturization and power reduction are the most important aspects calling for further research.
Keywords:  chip-scale atomic clock      coherent population trapping  
Received:  11 October 2013      Accepted manuscript online: 
PACS:  06.30.Ft (Time and frequency)  
  06.20.fb (Standards and calibration)  
  32.80.Qk (Coherent control of atomic interactions with photons)  
  07.10.Cm (Micromechanical devices and systems)  
Fund: Project support by the National Natural Science Foundation of China (Grant No. 11074012).
Corresponding Authors:  Wang Zhong     E-mail:  zw@pku.edu.cn

Cite this article: 

Wang Zhong Review of chip-scale atomic clocks based on coherent population trapping 2014 Chin. Phys. B 23 030601

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