Classification of q-pure q-weight maps over finite dimensional Hilbert spaces
An $E_0$-semigroup of $B(H)$ is a one parameter strongly continuous semigroup of $*$-endomorphisms of $B(H)$ that preserve the identity. Every $E_0$-semigroup that possesses a strongly continuous intertwining semigroup of isometries is cocycle conjugate to an $E_0$-semigroup induced by the Bhat induction of a $CP$-flow over a separable Hilbert space $K$. We say an $E_0$-semigroup $α$ is $q$-pure if the $CP$-subordinates $β$ of norm one (i.e. $\Vertβ_t(I)\Vert = 1$ and $α_t-β_t$ is completely positive for all $t \geq 0$) are totally ordered in the sense that if $β$ and $γ$ are two $CP$-subordinates of $α$ of norm one, then $β\geq γ$ or $γ\geq β$. This paper shows how to construct and classify all $q$-pure $E_0$-semigroups induced by $CP$-flows over a finite-dimensional Hilbert space $K$ up to cocycle conjugacy.