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)‡
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
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.
Received: 13 July 2006
Revised: 30 August 2006
Accepted manuscript online:
Fund: 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).
Cite this article:
Luo Jun(罗军), Sun Xian-Ping(孙献平), Zeng Xi-Zhi(曾锡之), and Zhan Ming-Sheng(詹明生) Optical pumping and population transfer of nuclear-spin states of caesium atoms in high magnetic fields 2007 Chinese Physics 16 998
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