Quantum cellular automata are important tools in understanding quantum dynamics, thanks to their simple and
effective list of rules. Here we consider a class of noisy, one-dimensional quantum cellular automata that allow
one to shift from unitary dynamics to completely positive maps, investigating the evolution of coherence as well
as the notion of reversibility in such a setting. To this aim, we associate an approximate reverse automaton to
each noisy automaton, and assess its effect, and we define an irreversibility time based on the distance from the
maximally mixed state, which is shown to be the only attractor of the automaton map in the presence of dephasing.
Our analysis illustrates the interplay between unitary and noisy dynamics
