The calculation of correlation functions in the quantum-state diffusion model

摘要

Recently, Gisin introduced a HdNenberg picture of the quantum-state diffusion model and considered correlation functions in this framework. It is shown here that these correlation functions in general do not coincide with the usual functions, in contrast with what one might have expected. Furthermore it is pointed out how conventiotial correlation functions can be calculated using the quantum-state diffusion model. For higher-order correlation functions this approach may offer advantages compared with the Monte Carlo wavefunction method.