  We study the properties of the quantum information transmission channel that
emerges from the quantum dynamics of particles interacting with a black hole
horizon. We calculate the quantum channel capacity in two limiting cases where
a single-letter capacity is known to exist: the limit of perfectly reflecting
and perfectly absorbing black holes. We find that the perfectly reflecting
black hole channel is closely related to the Unruh channel and that its
capacity is non-vanishing, allowing for the perfect reconstruction of quantum
information outside of the black hole horizon. We also find that the
complementary channel (transmitting entanglement behind the horizon) is
entanglement-breaking in this case, with vanishing capacity. We then calculate
the quantum capacity of the black hole channel in the limit of a perfectly
absorbing black hole and find that this capacity vanishes, while the capacity
of the complementary channel is non-vanishing instead. Rather than inviting a
new crisis for quantum physics, this finding instead is in accordance with the
quantum no-cloning theorem, because it guarantees that there are no space-like
surfaces that contain both the sender's quantum state and the receiver's
reconstructed quantum state.
