中国物理B ›› 2010, Vol. 19 ›› Issue (2): 20502-020502.doi: 10.1088/1674-1056/19/2/020502

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Phase diffusion of a two-component Bose-Einstein condensates:exact and short-time solutions for arbitrary coherent spin state

金光日, 王波波, 吕燕伍   

  1. Department of Physics, School of Science, Beijing Jiaotong University, Beijing 100044, China
  • 收稿日期:2009-03-20 修回日期:2009-09-22 出版日期:2010-02-15 发布日期:2010-02-15
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No.~10804007), the Special Research Foundation and Development Program (Grant No.~200800041003), and Research Funds of Beijing Jiaotong University (Grant No.~2007XM049).

Phase diffusion of a two-component Bose-Einstein condensates:exact and short-time solutions for arbitrary coherent spin state

Jin Guang-Ri(金光日), Wang Bo-Bo(王波波), and LÜ Yan-Wu(吕燕伍)   

  1. Department of Physics, School of Science, Beijing Jiaotong University, Beijing 100044, China
  • Received:2009-03-20 Revised:2009-09-22 Online:2010-02-15 Published:2010-02-15
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No.~10804007), the Special Research Foundation and Development Program (Grant No.~200800041003), and Research Funds of Beijing Jiaotong University (Grant No.~2007XM049).

摘要: We investigate phase diffusion of a two-component Bose--Einstein condensates prepared initially in arbitrary coherent spin state |θ00|. Analytical expression of the phase-diffusion time is presented for θ0~π/2 case. In comparison with the symmetrical case (i.e., θ0=π/2), we find that the diffusion process becomes slow due to the reduced atom number variance.

Abstract: We investigate phase diffusion of a two-component Bose--Einstein condensates prepared initially in arbitrary coherent spin state |$\theta_0$, $\phi_0\rangle$. Analytical expression of the phase-diffusion time is presented for $\theta_0\neq \pi/2$ case. In comparison with the symmetrical case (i.e., $\theta_0=\pi/2$), we find that the diffusion process becomes slow due to the reduced atom number variance.

Key words: Bose--Einstein condensates, phase diffusion, coherent spin states

中图分类号:  (Other Bose-Einstein condensation phenomena)

  • 03.75.Nt
05.30.Jp (Boson systems) 42.50.Dv (Quantum state engineering and measurements)