QUANTUM TRAJECTORIES FOR NONLINEAR-OPTICAL PROCESSES

The stochastic Schrodinger equation, a novel method for describing the dissipative dynamics of open quantum systems interacting with their e nvironment, is applied to some nonlinear optical processes, namely non linear absorption and second-harmonic generation, the latter also in t he range of instabilities and classical chaotic behaviour. Where possi ble the results are compared with numerical simulations of the positiv e P representation, which in some cases are found to give unreliable r esults.