  We study the transmission of information and correlations through quantum
fields in cosmological backgrounds. With this aim, we make use of quantum
information tools to quantify the classical and quantum correlations induced by
a quantum massless scalar field in two particle detectors, one located in the
early universe (Alice's) and the other located at a later time (Bob's). In
particular, we focus on two phenomena: a) the consequences on the transmission
of information of the violations of the strong Huygens principle for quantum
fields, and b) the analysis of the field vacuum correlations via correlation
harvesting from Alice to Bob. We will study a standard cosmological model first
and then assess whether these results also hold if we use other than the
general relativistic dynamics. As a particular example, we will study the
transmission of information through the Big Bounce, that replaces the Big Bang,
in the effective dynamics of Loop Quantum Cosmology.
