title: PT-symmetric quantum Liouvillean dynamics.
abstract: We discuss a combination of unitary and antiunitary symmetry of quantum Liouvillean dynamics, in the context of open quantum systems, which implies a D2 symmetry of the complex Liouvillean spectrum. For sufficiently weak system-bath coupling, it implies a uniform decay rate for all coherences, i.e., off-diagonal elements of the system's density matrix taken in the eigenbasis of the Hamiltonian. As an example, we discuss symmetrically boundary driven open XXZ spin 1/2 chains.
authors.affiliation: Department of Physics, FMF, University of Ljubljana, Ljubljana, Slovenia.
authors.forename: Tomaž
authors.initials: T
authors.lastname: Prosen