An attempt to summarize that in a blog entry is here
R. M Brower and N. P. Landsman described a bicategory of von Neumann algebras, Connes’ correspondences as morphisms and (bounded) intertwiners as 2-cells. They proved that the equivalence in that bicategory is the same as usual Morita equivalence of von Neumann algebras as studied by Mark Rieffel and others.
Revised on May 25, 2012 13:38:52
by Urs Schreiber