  Considerations of high energies in quantum field theories on smooth manifolds
have led to generalized uncertainty principles and the possibility of a
physical minimal length in quantum gravitational scenarios. In these models,
the minimal length would be a physical limit, not just a mathematical tool, and
should be Lorentz invariant. In this paper, we study two-qubit communication
and entanglement harvesting in a field subject to a covariant bandlimit
(minimum length) and present the changes induced by this bandlimit. We find the
bandlimit introduces nonlocality and acausal communication in a manner unlike
non-covariant bandlimits or other quantum optical approximations. We also
observe that this covariant bandlimit introduces uncertainties in time and
temporal ordering with the unusual behavior attributed to the behavior of
virtual particles being modified by the covariant cutoff.
