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Collective two-color photoassociation of a freely-interacting 87RbBose-Einstein condensate is theoretically examined, focusing on stimulatedRaman adiabatic passage (STIRAP) from an atomic to a stable molecularcondensate. In particular, Drummond et al. [Phys. Rev. A 65, 063619 (2002);cond-mat/0110578] have predicted that particle-particle interactions can limitthe efficiency of collective atom-molecule STIRAP, and that optimizing thelaser parameters can partially overcome this limitation. We suggest that themolecular conversion efficiency can be further improved by treating the initialcondensate density as an optimization parameter.Comment: 2 pages, 1 figure, re-submitted to PRA; v4 is our final answer;  removed results on Feshbach-tuned efficiency; added discussion of negligible  noncondensate mode

Comment on “Stimulated Raman adiabatic passage from an atomic to a molecular Bose-Einstein condensate”