中国物理B ›› 2012, Vol. 21 ›› Issue (3): 34204-034204.doi: 10.1088/1674-1056/21/3/034204

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李中华,李媛,豆亚芳,张俊香   

  • 收稿日期:2011-10-10 修回日期:2011-11-09 出版日期:2012-02-15 发布日期:2012-02-15
  • 通讯作者: 张俊香,junxiang@sxu.edu.cn E-mail:junxiang@sxu.edu.cn

The difference in noise property between the Autler–Townes splitting medium and the electromagnetically induced transparent medium

Li Zhong-Hua(李中华), Li Yuan(李媛), Dou Ya-Fang(豆亚芳), and Zhang Jun-Xiang(张俊香)   

  1. State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Opto-Electronics, Shanxi University, Taiyuan 030006, China
  • Received:2011-10-10 Revised:2011-11-09 Online:2012-02-15 Published:2012-02-15
  • Contact: Zhang Jun-Xiang,junxiang@sxu.edu.cn E-mail:junxiang@sxu.edu.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 10974126 and 60821004) and the National Basic Research Program of China (Grant No. 2010CB923102).

Abstract: The quantum noise of squeezed probe light passing through an atomic system with different electromagnetically induced transparency and Autler-Townes splitting effects is investigated theoretically. It is found that the optimal squeezing preservation of the outgoing probe beam occurs in the strong-coupling-field regime rather than in the weak-coupling-field regime. In the weak-coupling-field regime, which was recently recognized as the electromagnetically induced transparency regime (Abi-Salloum T Y 2010 Phys. Rev. A 81 053836), the output amplitude noise is affected mainly by the atomic noise originating from the random decay process of atoms. While in the strong-coupling-field regime, defined as the Autler-Townes splitting regime, the output amplitude noise is affected mainly by the phase-to-amplitude conversion noise. This is useful in improving the quality of the experiment for efficient quantum memory, and hence has an application in quantum information processing.

Key words: Autler-Townes splitting, electromagnetically induced transparency, quantum noise

中图分类号:  (Effects of atomic coherence on propagation, absorption, and Amplification of light; electromagnetically induced transparency and Absorption)

  • 42.50.Gy
42.50.Hz (Strong-field excitation of optical transitions in quantum systems; multiphoton processes; dynamic Stark shift) 42.50.Lc (Quantum fluctuations, quantum noise, and quantum jumps) 03.67.-a (Quantum information)