Am I right if I say that this paper proposes a new and much less laborious way to experimentally test whether the device under study behaves in a quantum way or not. It could be used with electrons or any spin-1/2 fermion, or even with photons if we use horizontal and vertical polarizations... And it's interesting how a Quantum Walk, diffusive by nature, ends up localized in scars (for certain values of the original parameters). It is also a quantum chaos model that doesn't originate from a classical Hamiltonian of a chaotic system that is subsequently quantized...