  We construct string topology operations in twisted K-theory. We study the
examples given by symplectic Grassmannians, computing the twisted K-theory of
the loop spaces of quaternionic projective spaces in detail. Via the work of
Freed-Hopkins-Teleman, these computations are related to completions of the
Verlinde algebras of Sp(n). We compute these completions, and other relevant
information about the Verlinde algebras. We also identify the completions with
the twisted K-theory of the Gruher-Salvatore pro-spectra. Further comments on
the field theoretic nature of these constructions are made.
