  We demonstrate, in the regime of ultrastrong matter-field coupling, the
strong connection between the dynamical Casimir effect (DCE) and the
performance of quantum information protocols. Our results are illustrated by
means of a realistic quantum communication channel and show that the DCE is a
fundamental limit for quantum computation and communication and that novel
schemes are required to implement ultrafast and reliable quantum gates.
Strategies to partially counteract the DCE are also discussed.
