Invariants for Normal Completely Positive Maps on the Hyperfinite $II_1$ Factor

Abstract

We investigate certain classes of normal completely positive (CP) maps on the hyperfinite $II_1$ factor $\mathcal A$. Using the representation theory of a suitable irrational rotation algebra, we propose some computable invariants for such CP maps.

13 pages, To be published in Proc. Ind. Acad. Sci. (Math. Sci.)