中国物理B ›› 2007, Vol. 16 ›› Issue (4): 998-1007.doi: 10.1088/1009-1963/16/4/023

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Optical pumping and population transfer of nuclear-spin states of caesium atoms in high magnetic fields

孙献平1, 曾锡之1, 詹明生1, 罗军2   

  1. (1)State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, China；Center for Cold Atom Physics, Chinese Academy of Sciences, Wuhan 430071, China; (2)State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, China；Center for Cold Atom Physics, Chinese Academy of Sciences, Wuhan 430071, China；Gradua
  • 收稿日期:2006-07-13 修回日期:2006-08-30 出版日期:2007-04-20 发布日期:2007-04-20
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos 10374103 and 10574143), and the National Basic Research Program of China (Grant No 2001CB309309).

Optical pumping and population transfer of nuclear-spin states of caesium atoms in high magnetic fields

Luo Jun(罗军)a)b)c)†, Sun Xian-Ping(孙献平)a)b), Zeng Xi-Zhi(曾锡之)a)b), and Zhan Ming-Sheng(詹明生)a)b)‡   

  1. a State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, China; b Center for Cold Atom Physics, Chinese Academy of Sciences, Wuhan 430071, China; c Graduate School of the Chinese Academy of Sciences, Beijing 100049, China
  • Received:2006-07-13 Revised:2006-08-30 Online:2007-04-20 Published:2007-04-20
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos 10374103 and 10574143), and the National Basic Research Program of China (Grant No 2001CB309309).

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摘要： Nuclear-spin states of gaseous-state Cs atoms in the ground state are optically manipulated using a Ti:sapphire laser in a magnetic field of 1.516T, in which optical coupling of the nuclear-spin states is achieved through hyperfine interactions between electrons and nuclei. The steady-state population distribution in the hyperfine Zeeman sublevels of the ground state is detected by using a tunable diode laser. Furthermore, the state population transfer among the hyperfine Zeeman sublevels, which results from the collision-induced modification \delta a(\bm S \cdot \bm I) of the hyperfine interaction of Cs in the ground state due to stochastic collisions between Cs atoms and buffer-gas molecules, is studied at different buffer-gas pressures. The experimental results show that high-field optical pumping and the small change \delta a(\bm S \cdot \bm I) of the hyperfine interaction can strongly cause the state population transfer and spin-state interchange among the hyperfine Zeeman sublevels. The calculated results maybe explain the steady-state population in hyperfine Zeeman sublevels in terms of rates of optical-pumping, electron-spin flip, nuclear spin flip, and electron-nuclear spin flip-flop transitions among the hyperfine Zeeman sublevels of the ground state of Cs atoms. This method may be applied to the nuclear-spin-based solid-state quantum computation.

关键词: high magnetic field, optical pumping, hyperfine interaction changing, nuclear-spin and electron spin state

Abstract: Nuclear-spin states of gaseous-state Cs atoms in the ground state are optically manipulated using a Ti:sapphire laser in a magnetic field of 1.516T, in which optical coupling of the nuclear-spin states is achieved through hyperfine interactions between electrons and nuclei. The steady-state population distribution in the hyperfine Zeeman sublevels of the ground state is detected by using a tunable diode laser. Furthermore, the state population transfer among the hyperfine Zeeman sublevels, which results from the collision-induced modification $\delta a(S \cdot I)$ of the hyperfine interaction of Cs in the ground state due to stochastic collisions between Cs atoms and buffer-gas molecules, is studied at different buffer-gas pressures. The experimental results show that high-field optical pumping and the small change $\delta a(S \cdot I)$ of the hyperfine interaction can strongly cause the state population transfer and spin-state interchange among the hyperfine Zeeman sublevels. The calculated results maybe explain the steady-state population in hyperfine Zeeman sublevels in terms of rates of optical-pumping, electron-spin flip, nuclear spin flip, and electron-nuclear spin flip-flop transitions among the hyperfine Zeeman sublevels of the ground state of Cs atoms. This method may be applied to the nuclear-spin-based solid-state quantum computation.

Key words: high magnetic field, optical pumping, hyperfine interaction changing, nuclear-spin and electron spin state

中图分类号:  (Level crossing and optical pumping)

  • 32.80.Xx
32.60.+i (Zeeman and Stark effects) 32.10.Fn (Fine and hyperfine structure)