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Coherent Population Trapping Induced by Phase Modulated and Fluctuating Fields |
WANG Jian;HU Xiang-Ming |
Department of Physics, Huazhong Normal University, Wuhan 430079 |
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Cite this article: |
WANG Jian, HU Xiang-Ming 2007 Chin. Phys. Lett. 24 424-427 |
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Abstract We examine the effects of cross correlated phase fluctuations on the coherent population trapping (CPT) induced by a pair of phase-modulated fields with equal modulation frequencies in a three-level Λ system. The maximal coherence of -0.5, which appears when CPT occurs for equal modulation indices, is preserved in the presence of the critically cross-correlated fluctuations. Unexpectedly, the non-maximal coherence, which is established when CPT is obtained for different modulation indices, is significantly enhanced due to the critically cross-correlated fluctuations.
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Keywords:
42.50.Gy
42.50.Lc
32.80.Qk
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Received: 08 September 2006
Published: 24 February 2007
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PACS: |
42.50.Gy
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(Effects of atomic coherence on propagation, absorption, and Amplification of light; electromagnetically induced transparency and Absorption)
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42.50.Lc
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(Quantum fluctuations, quantum noise, and quantum jumps)
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32.80.Qk
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(Coherent control of atomic interactions with photons)
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