They did it. Enfin c'est ce qu'ils disent et qui a été publié dans " Physical Review Letters - Direct Measurements of Collisional Dynamics in Cold Atom Triads ".
Howto ?
A myriad of equipment including lasers, mirrors, a vacuum chamber, and microscopes assembled in Otago's Department of Physics, plus a lot of time, energy, and expertise, have provided the ingredients to investigate this quantum process, which until now was only understood through statistical averaging from experiments involving large numbers of atoms.
et plus ;)