Christensen-Evans theorem and extensions of GNS-symmetric quantum Markov semigroups

Understand

In this note we prove a refined version of the Christensen-Evans theorem for generators of uniformly continuous GNS-symmetric quantum Markov semigroups.

• We use this result to show the existence of GNS-symmetric extensions of GNS-symmetric quantum Markov semigroups.
• In particular, this implies that the generators of GNS-symmetric quantum Markov semigroups on finite-dimensional von Neumann algebra can be written in the form specified by Alicki's theorem.