Coherent Diffusion of Polaritons in Atomic Media
  Coherent diffusion pertains to the motion of atomic dipoles experiencing frequent collisions in vapor while maintaining their coherence. Recent theoretical and experimental studies on the effect of coherent diffusion on key Raman processes, namely Raman spectroscopy, slow polariton propagation, and stored light, are reviewed in this Colloquium. 
Ofer Firstenberg, Moshe Shuker, Amiram Ron, Nir Davidson
quant-ph physics.atom-ph