Hp. Breuer et al., HEISENBERG PICTURE OPERATORS IN THE QUANTUM-STATE DIFFUSION-MODEL, Journal of physics. A, mathematical and general, 31(7), 1998, pp. 147-151
A stochastic simulation algorithm for the computation of multitime cor
relation functions which is based on the quantum-state diffusion model
of open systems is developed. The crucial point of the proposed schem
e is a suitable extension of the quantum master equation to a doubled
Hilbert space which is then unravelled by a stochastic differential eq
uation.