Correlation enhanced phase sensitive Raman scattering in atomic vapors
  We theoretically propose a method to enhance Raman scattering by injecting a seeded light field which is correlated with the initially prepared atomic spin wave. Such a light-atom correlation leads to an interference in the Raman scattering. The interference is sensitive to the relative phase between the seeded light field and initially prepared atomic spin wave. For constructive interference, the Raman scattering is greatly enhanced. Such an enhanced Raman scattering may find applications in quantum information, nonlinear optics and optical metrology due to its simplicity. 
Chun-Hua Yuan, L. Q. Chen, Z. Y. Ou, and Weiping Zhang
quant-ph