Basic ideas of quantum mechanics of open systems in application to electron and optic processes

摘要

Kinetics of a quantum system immersed in an equilibrium medium and completely described by its statistical operator is investigated. The case of a separable interaction is considered in details. A concept of the effective Hamilton operator of the system is discussed. The kinetic equation for a point particle in a spatially uniform external field placed in a medium of point particles is obtained in terms of the Wigner distribution function of a particle. The kinetic equation is applicable for strong spatially inhomogeneous (localized) states of the particle and strong external field. The elaborated theory is used also for a system of two-level emitters and photons interacting with an equilibrium phonon medium. The kinetic equation for the statistical operator of the system of the emitters and photons that describes the effect of emitter motion on the super radiance phenomenon is obtained.