Canonical decoupling of different degrees of freedom for a two-level system coupled to phonons
G. Benivegna, ANTONINO MESSINA · Journal of Physics A Mathematical and General · 1994
We consider the quantum model of a two-level system linearly coupled to M harmonic oscillators. Using symmetry arguments we show the existence of new constants of motion for this physical system. Starting with this knowledge, we develop a systematic treatment by which an effective canonical decoupling of different degrees of freedom is obtained.