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Chin. Phys. B, 2021, Vol. 30(8): 083203    DOI: 10.1088/1674-1056/ac0528
ATOMIC AND MOLECULAR PHYSICS Prev   Next  

Light-shift induced by two unbalanced spontaneous decay rates in EIT (CPT) spectroscopies under Ramsey pulse excitation

Xiaoyan Liu(刘晓艳)1,2, Xu Zhao(赵旭)1,3, Jianfang Sun(孙剑芳)1,2, Zhen Xu(徐震)1,2,†, and Zhengfeng Hu(胡正峰)1,2,3,4,‡
1 The Key Laboratory of Quantum Optics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China;
2 Center of Materials Science and Optoelectronics Engineering, University of the Chinese Academy of Sciences, Beijing 100049, China;
3 Department of Physics, Shanghai University, Shanghai 200444, China;
4 CAS Center for Excellence in Ultra-intense Laser Science, Shanghai 201800, China
Abstract  Light shift is important and inevitably affects the long-term stability of an atomic clock. In this work, considering two unbalanced branches of the spontaneous decay rate in a three-level system, we studied the frequency shifts of electromagnetically induced transparency (EIT) and coherent population trapping (CPT) clocks operating under the pulse sequence regime by numerically solving the Liouville density matrix equations. The results show that the frequency shifts are larger when the two branches of spontaneous emission rate are not equal compared to the equal case. In addition, in EIT-Ramsey, the effect of the unbalanced branches of the spontaneous decay rate and relaxations of low-energy states on the frequency shift is greater than that of Rabi frequency. In CPT-Ramsey, the relaxations of low-energy states play a dominant role in frequency shift.
Keywords:  atom clock      light shfit      laser-atom interaction      quantum optics  
Received:  25 March 2021      Revised:  20 May 2021      Accepted manuscript online:  26 May 2021
PACS:  32.70.Jz (Line shapes, widths, and shifts)  
  32.80.Qk (Coherent control of atomic interactions with photons)  
  37.10.Jk (Atoms in optical lattices)  
  06.20.Jr (Determination of fundamental constants)  
Fund: Project supported by the State Key Laboratory of Low Dimensional Quantum Physics Research Program, Tsinghua University (Grant No. KF201707).
Corresponding Authors:  Zhen Xu, Zhengfeng Hu     E-mail:  xuzhen@siom.ac.cn;zfhu@siom.ac.cn

Cite this article: 

Xiaoyan Liu(刘晓艳), Xu Zhao(赵旭), Jianfang Sun(孙剑芳), Zhen Xu(徐震), and Zhengfeng Hu(胡正峰) Light-shift induced by two unbalanced spontaneous decay rates in EIT (CPT) spectroscopies under Ramsey pulse excitation 2021 Chin. Phys. B 30 083203

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