Study of Quantum Decoherence in a finite system : Three Schrodinger cats, Nuclear collective motion, Crossing of Classical orbits and Decoherence(Fundamental Problems and Applications of Quantum Field Theory-Topological Aspects of Quantum Field Theory-)

Abstract

We studied about the quantum decoherence in finite system as nucleus. Decoherence is a non-unitary process, so called "the collapse of the wave function". It depends on the system's irreversibility. We used the harmonic three body system. This is the extreme reduction of Caldeira-Leggett's model.