  In the present work we explore a suitable coarse graining channel as a tool
to describe the effective entanglement spreading in a coarse-grained spin-chain
with different degrees of resolution. Comparing it with the experimental
realizations performed with ultracold atoms, our results suggest that even if
we are not able to fully resolve the system, entanglement can still be detected
for some coarse graining levels. Furthermore, we show that it is possible to
have some information about the "microscopic" entanglement, even if we have
access only to the system's coarse-grained description. We show that the amount
of entanglement decays exponentially with the lack of system resolution. The
lack of experimental resolution might thus lead to an effective classical
description.
