Four-Wave Mixing with Photons and Atoms
Vendredi 6 mai 2011
salle C. Brot
Four-wave mixing is a familiar topic in the field of nonlinear optics and the techniques for studying it have been well-developed over the years. Recently, a number of interesting experiments have pointed out a nearly parallel situation in spinor Bose-Einstein condensates, which gives us the opportunity to observe similar phenomena, and to transfer some of the techniques of nonlinear optics to the field of nonlinear atom optics. In optical four-wave mixing a nonlinear medium works to convert a pair of pump photons into a probe and conjugate pair at different frequencies. The analogy in a F = 1 spinor BEC is to collisionally convert, for instance, a pair of mF = 0 atoms into an mF = +1 and mF = -1 pair. In our lab we study both situations. We work with four-wave mixing in hot Rb vapor using a double-lambda atomic level scheme to generate squeezed light. We have generated strongly entangled multi-spatial mode beams (images) using this technique. We also work with an F = 1 sodium spinor condensate which can be manipulated to look like a four-wave mixing system. I will discuss experiments in each of these systems aimed at improved quantum measurements.
Voir en ligne : Joint Quantum Institute, University of Maryland
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