Nonlinear optics provides a way to generate light with different frequencies and different quantum statistical properties. We have developed a nonlinear 4-wave mixing technology in atomic vapors for generating non-classical light. Our technique allows the squeezed light to be generated in multiple spatial modes (images) and this allows us to directly apply such sub-shot-noise advantages to image processing applications.
Collisions between laser-cooled atoms, in particular amongst those in Bose-Einstein condensates, can allow the coherent manipulation of clouds of atoms. We study spinor condensates, where the atoms can be in a superposition of internal quantum states and investigate the internal-state dynamics of the cloud.