63 research outputs found
Non-Hermitian wave packet approximation for coupled two-level systems in weak and intense fields
We introduce an accurate non-Hermitian Schr\"odinger-type approximation of
Bloch optical equations for two-level systems. This approximation provides a
complete description of the excitation, relaxation and decoherence dynamics in
both weak and strong laser fields. In this approach, it is sufficient to
propagate the wave function of the quantum system instead of the density
matrix, providing that relaxation and dephasing are taken into account via
automatically-adjusted time-dependent gain and decay rates. The developed
formalism is applied to the problem of scattering and absorption of
electromagnetic radiation by a thin layer comprised of interacting two-level
emitters
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