Decoherence time in self-induced decoherence

This is the authors' abstract. We don't add key points for this paper.

A general method for obtaining the decoherence time in self-induced decoherence is presented. In particular, it is shown that such a time can be computed from the poles of the resolvent or of the initial conditions in the complex extension of the Hamiltonian's spectrum. Several decoherence times are estimated: 10^-13--10^-150.3em0exs for microscopic systems, and 10^-37--10^-390.3em0exs for macroscopic bodies. For the particular case of a thermal bath, the order of magnitude of our results agrees with that obtained by the einselection (environment-induced decoherence) approach.