Sandro Graffi — Università di Bologna #
Stability of the quantum harmonic oscillator under weak non-resonant forcing #
It ia proved through a KAM procedure the pure point nature of the Floquet spectrum of the weakly forced quantum 
harmonic oscillator under no-resonance conditions, Explciti estimates are worked out on the amplitude of the 
forcing term and on the ratios between the diophantine constants of the frequencies.