Quantum Monte Carlo >Quantum Monte Carlo encompasses a large family of computational methods whose common aim is the study of complex quantum systems. > One of the major goals of these approaches is to provide a reliable solution (or an accurate approximation)of the quantum many-body problem. >The diverse flavor of quantum Monte Carlo approaches all share the common use of the Monte Carlo method to handle the multi- dimensional integrals that arise in the different formulations of the many-body problem. >The quantum Monte Carlo methods allow for a direct treatment and description of complex many-body effects encoded in the wave function,going beyond mean field theory and offering an exact solution of the many-body problem in some circumstances.Quantum Monte Carlo Quantum Monte Carlo encompasses a large family of computational methods whose common aim is the study of complex quantum systems. One of the major goals of these approaches is to provide a reliable solution (or an accurate approximation) of the quantum many-body problem. The diverse flavor of quantum Monte Carlo approaches all share the common use of the Monte Carlo method to handle the multi￾dimensional integrals that arise in the different formulations of the many-body problem. The quantum Monte Carlo methods allow for a direct treatment and description of complex many-body effects encoded in the wave function, going beyond mean field theory and offering an exact solution of the many-body problem in some circumstances