  We investigate how quantum information, encoded in a quantum field, evolves
during the expansion of spacetime. Due to information loss across the horizon,
a local observer experiences this evolution as a nonunitary quantum channel. We
obtain this channel in the case of de Sitter spacetime by assuming the initial
global state encodes a signal state via fluctuations of the Bunch-Davies
vacuum. Notably, de Sitter evolution exhibits intriguing cloning properties,
establishing a connection between the curvature of spacetime and the
propagation of quantum information.
