research My research activity has ranged over a variety of topics, usually within a theoretical, sometime mathematical and probabilistic, approach, also with the help of numerical techniques, but never neglecting the phenomenological aspects. A common feature is the study of complex quantum systems, i.e. systems where the presence of many, quantum degrees of freedom is the source of phenomena that do not take place at the classical level or for a few degrees of freedom. Paraphrasing the famous paper by P.W. Anderson, more is different but quantum more is even more different. A list of keywords describing my research activity should include: probabilistic representation of linear flows, Monte Carlo methods for many-body systems, quantum computing, chiral systems, degenerate dilute gases, dark solitons in nonlinear Schrdinger equations, quantum theory of measurement and classical limit, chaos in many-body quantum systems, transport properties in resonant tunneling heterostructures, Schrdinger equations with concentrated nonlinearities, quantum noise in tunneling, stochastic resonance, Auger spectroscopy in metallic systems.