| In this talk, we shall present a new proof of homomorphic property of a given quantum stochastic flow with unbounded structure maps. As an application of this, we are able to prove the existence of Evans-Hudson dilation for a large class of symmetric quantum dynamical semigroups with unbounded generators and also prove an analogue of the Trotter-Kato product formula in the setting of quantum stochastic flows. Some examples and applications to classical probability will be discussed (if time permits). |