中国物理B ›› 2012, Vol. 21 ›› Issue (7): 70309-070309.doi: 10.1088/1674-1056/21/7/070309

• GENERAL • 上一篇    下一篇

Two methods to deal with inhomogenous Rabi frequency in microwave transition

程峰, 王育竹   

  1. The Laboratory of Quantum Optics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China Center for Cold Atom Physics, Chinese Academy of Sciences, Shanghai 201800, China
  • 收稿日期:2012-01-11 修回日期:2012-04-16 出版日期:2012-06-01 发布日期:2012-06-01
  • 基金资助:
    Project supported by the National Basic Research Program of China (Grant No. 2011CB921504) and the National Natural Science Foundation of China (Grant No. 10974210).

Two methods to deal with inhomogenous Rabi frequency in microwave transition

Cheng Feng(程峰) and Wang Yu-Zhu(王育竹)†   

  1. The Laboratory of Quantum Optics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China Center for Cold Atom Physics, Chinese Academy of Sciences, Shanghai 201800, China
  • Received:2012-01-11 Revised:2012-04-16 Online:2012-06-01 Published:2012-06-01
  • Contact: Wang Yu-Zhu E-mail:yzwang@mail.shcnc.ac.cn
  • Supported by:
    Project supported by the National Basic Research Program of China (Grant No. 2011CB921504) and the National Natural Science Foundation of China (Grant No. 10974210).

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摘要： We analysed the influence of inhomogenous microwave field on the coherence of atom ensembles. Two methods were proposed to suppress the dephasing generated by the inhomogenous Rabi frequency. One of them was realized by spin echo, and the other one was based on the identical spin rotation effect. The results of calculation showed that the contrast of signal acquired in experiment can be improved by the two methods. Their advantages and drawbacks were discussed. We hope they could be used to improve the contrast of experimental signal in the situation that the microwave fields are very inhomogenous. Finally, we discussed the case of continuous working microwave field and showed that the dipole force raised with the inhomogeneity can be eased by spin flip.

关键词: inhomogenous microwave field, spin echo, identical spin rotation effect

Abstract: We analysed the influence of inhomogenous microwave field on the coherence of atom ensembles. Two methods were proposed to suppress the dephasing generated by the inhomogenous Rabi frequency. One of them was realized by spin echo, and the other one was based on the identical spin rotation effect. The results of calculation showed that the contrast of signal acquired in experiment can be improved by the two methods. Their advantages and drawbacks were discussed. We hope they could be used to improve the contrast of experimental signal in the situation that the microwave fields are very inhomogenous. Finally, we discussed the case of continuous working microwave field and showed that the dipole force raised with the inhomogeneity can be eased by spin flip.

Key words: inhomogenous microwave field, spin echo, identical spin rotation effect

中图分类号:  (Decoherence; open systems; quantum statistical methods)

  • 03.65.Yz
03.75.Be (Atom and neutron optics)