Coarse grained open system quantum dynamics.
We show that the quantum dynamics of a system comprised of a subspace Q coupled to a larger subspace P can be recast as a reduced set of "coarse grained" ordinary differential equations with constant coefficients. These equations can be solved by a single diagonalization of a general complex matrix. The method makes no assumptions about the strength of the couplings between the Q and the P subspaces, nor is there any limitation on the initial population in P. The utility of the method is demonstrated via computations in three following areas: molecular compounds, photonic materials, and condensed phases.
Thanopulos
Ioannis
I
Department of Chemistry, The University of British Columbia, Vancouver V6T 1Z3, Canada. ithano@eie.gr
Brumer
Paul
P
Shapiro
Moshe
M