  Motivated by the fact that the null-shell of a collapsing black hole can be
described by a perfectly reflecting accelerating mirror, we investigate an
extension of this model to mirror semi-transparency and derive a general
implicit expression for the corresponding Bogoliubov coefficients. Then, we
turn this into an explicit analytical form by focusing on mirrors that are
accelerated via an impulsive force. From the so-obtained Bogoliubov
coefficients we derive the particle production. Finally, we realize the field
coming from left-past spacetime region, passing through the semitransparent
moving mirror and ending up to right-future spacetime region as undergoing the
action of a Gaussian quantum channel. We study the transmission and noisy
generation properties of this channel, relating them to the Bogoliubov
coefficients of the mirror's motion, through which we evaluate capacities in
transmitting classical and quantum information.
