%0 Journal Article %T Superposition of macroscopic numbers of atoms and molecules %A John Calsamiglia %A Matt Mackie %A Kalle-Antti Suominen %J Physics %D 2001 %I arXiv %R 10.1103/PhysRevLett.87.160403 %X We theoretically examine photoassociation of a non-ideal Bose-Einstein condensate, focusing on evidence for a macroscopic superposition of atoms and molecules. This problem raises an interest because, rather than two states of a given object, an atom-molecule system is a seemingly impossible macroscopic superposition of different objects. Nevertheless, photoassociation enables coherent intraparticle conversion, and we thereby propose a viable scheme for creating a superposition of a macroscopic number of atoms with a macroscopic number of molecules. %U http://arxiv.org/abs/cond-mat/0103437v2