  We ask whether quantum teleportation from the outside to the inside of a
horizon is possible, using entanglement extracted from a vacuum. We first
calculate analytically, within the perturbation theory, entanglement extracted
from the Minkowski vacuum into a pair of an inertial and an accelerated
Unruh-DeWitt detectors, which are initially in the ground states and interact
with a neutral massless scalar field for an infinitely long time. We find that
entanglement can be extracted, but is "fragile", depending on adiabaticity of
switching of the detectors at the infinite past and future. We then consider
the standard scheme of quantum teleportation utilizing the extracted
entanglement, and find that the standard teleportation is not superior to
channels without entanglement.
