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Chin. Phys. B, 2012, Vol. 21(2): 023201    DOI: 10.1088/1674-1056/21/2/023201
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Subluminal to superluminal light propagation in a V-type three-level atomic system interacting with squeezed vacuum

Zhang Qin(张琴)a)†, Qu Guang-Hui(屈光辉)a), Tang Yuan-He(唐远河)a), Jin Kang(金康)b), and Ji Wei-Li(纪卫莉)a)
a. Department of Physics, Xi'an University of Technology, Xi'an 710054, China;
b. Department of Physics, Northwest University, Xi'an 710069, China
Abstract  We study the light propagation properties in a V-type three-level atomic system interacting with two independent broadband squeezed baths. Using the graphic method, the dependences of the absorption and the dispersion of the system on the coupling field strength, the incoherent pumping field strength and the intensity of the squeezed vacuum are analysed. The result shows that the probe pulse propagation can be changed from subluminal to superluminal speed.
Keywords:  squeezed vacuum      group velocity      superluminal propagation      subluminal propagation  
Received:  14 July 2011      Revised:  29 August 2011      Accepted manuscript online: 
PACS:  32.80.Qk (Coherent control of atomic interactions with photons)  
  37.10.Vz (Mechanical effects of light on atoms, molecules, and ions)  
  42.50.-p (Quantum optics)  
  42.50.Nn (Quantum optical phenomena in absorbing, amplifying, dispersive and conducting media; cooperative phenomena in quantum optical systems)  
Fund: Project supported by the National Natural Science Foundation of China (Grant No. 10874138).
Corresponding Authors:  Zhang Qin,     E-mail:

Cite this article: 

Zhang Qin(张琴), Qu Guang-Hui(屈光辉), Tang Yuan-He(唐远河), Jin Kang(金康), and Ji Wei-Li(纪卫莉) Subluminal to superluminal light propagation in a V-type three-level atomic system interacting with squeezed vacuum 2012 Chin. Phys. B 21 023201

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