On the existence of stationary states for quantum dynamical semigroups
Franco Fagnola, Rolando Rebolledo · Journal of Mathematical Physics · 2001
We provide two criteria on the existence of stationary states for quantum dynamical semigroups. The first one is based on the semigroup itself, while the second criterion is based on the generator which is in general unbounded and interpreted as a sesquilinear form. These results are illustrated by physical examples drawn from quantum optics.