On Propagation of Information in Quantum Mechanics and Maximal Velocity Bounds

We revisit key notions related to evolution of quantum information in quantum mechanics and prove uniform bounds on the maximal speed of propagation of quantum information for states and observables with exponential error bounds. Our results imply, in particular, a quantum mechanical version of the Lieb-Robinson bound, which is known to yield various constraints on propagation of quantum information. We propose a novel approach to proving maximal speed bounds.