Tunable source of correlated atom beams
  We use a one-dimensional optical lattice to modify the dispersion relation of atomic matter waves. Four-wave mixing in this situation produces atom pairs in two well defined beams. We show that these beams present a narrow momentum correlation, that their momenta are precisely tunable, and that this pair source can be operated both in the regime of low mode occupancy and of high mode occupancy. 
Marie Bonneau (LCF), Josselin Ruaudel (LCF), Rapha\"el Lopes (LCF),   Jean-Christophe Jaskula (LCF), Alain Aspect (LCF), Den...
cond-mat.quant-gas physics.atom-ph quant-ph