Relativistic quantum teleportation protected by the anti-Unruh effect

We investigate standard quantum teleportation in a relativistic setting where one participant, Rob, undergoes uniform acceleration while Alice remains inertial. Rob interacts locally with a massive scalar field modeled by an Unruh-DeWitt detector. We show that for small detector energy gaps, the entanglement shared between Alice and Rob increases monotonically with acceleration. For larger gaps, entanglement initially decreases at low accelerations due to the Unruh effect, but is subsequently restored and enhanced at higher accelerations as a consequence of the anti-Unruh effect. This behavior is associated with a reduction of the effective detector temperature, leading to a recovery of quantum coherence previously lost to the field. As a result, the teleportation fidelity increases with acceleration and approaches unity in the high-acceleration regime. Our results demonstrate that the anti-Unruh effect can protect and recover quantum information, providing a potential mechanism to mitigate relativistic degradation of quantum correlations.