Complex Time Evolution of Open Quantum Systems
Christos N. Gagatsos, A. I. Karanikas, G. Kordas · Open Systems & Information Dynamics · 2011
We combine, in a single set-up, complex time parametrization in path integration, and closed time formalism of non-equilibrium field theories to produce a compact representation of time evolution of the reduced density matrix. In this framework we introduce a cluster-type expansion that facilitates perturbative and non-petrurbative calculations in the realm of open quantum systems. The technical details of some very simple examples are discussed.