Vladimirov, IgorPetersen, Ian2026-07-042026-07-04ORCID:/0000-0003-4856-9450/work/219310000https://hdl.handle.net/1885/733812910This paper develops a dissipativity theory for dynamical systems governed by linear Itˆo stochastic differential equations driven by random noise with an uncertain drift. The deviation of the noise from a standard Wiener process in the nominal model is quantified by relative entropy. The paper discusses a dissipation inequality for the noise relative entropy supply. The problem of minimizing the supply required to drive the system between given Gaussian state distributions over a specified time horizon is considered. This problem, known in the literature as the Schr¨odinger bridge, was treated previously in the context of reciprocal processes. The paper obtains a closed- form smooth solution to a Hamilton-Jacobi equation for the minimum required relative entropy supply by using nonlinear algebraic techniques.This work is supported by the Australian Research Council8en2010