  We study the quantum channel between two localized first-quantized systems
that communicate in 3+1 dimensional Schwarzschild spacetime via a quantum
field. We analyze the information carrying capacity of direct and black
hole-orbiting null geodesics as well as of the timelike contributions that
arise because the strong Huygens principle does not hold on the Schwarzschild
background. We find, in particular, that the non-direct-null and timelike
contributions, which do not possess an analog on Minkowski spacetime, can
dominate over the direct null contributions. We cover the cases of both
geodesic and accelerated emitters. Technically, we apply tools previously
designed for the study of wave propagation in curved spacetimes to a
relativistic quantum information communication setup, first for generic
spacetimes, and then for the case of Schwarzschild spacetime in particular.
