Before revision: This paperis on the application of information theory to the analysis of fundamental lower bounds on the maximum deviations in feedback control systems, where the plant  is linear time-invariant while the controller can generically be any causal functions as long as it stabilizes the plant.
After revision: This paperis on the application of information theory to the analysis of fundamental lower bounds on the maximum deviations in feedback control systems, where the plant (i.e., the dynamical system to be controlled) is linear time-invariant while the controller can generically be any causal functions as long as it stabilizes the plant.