  We outline an extension of the classical Langevin equation to a quantum
formulation of the treatment of dissipation and fluctuations of all collective
degrees of freedom with unitary evolution of a many-fermion system within an
extension of the time-dependent density functional theory. We illustrate the
method by computing the distribution of fission fragment yields for $^{258}$Fm
in a quantum hydrodynamic approach and a typical trajectory with full
unrestricted density functional theory augmented with dissipation and
fluctuations.
