Quantum gravity as a communication resource

TL;DR

This paper explores how quantum coherence in black holes and spacetime can act as a resource to enhance quantum communication, challenging classical assumptions and revealing new operational roles for quantum gravity.

Contribution

It demonstrates that quantum features of spacetime can mitigate entanglement degradation, offering a novel perspective on quantum gravity's role in quantum information.

Findings

Quantum coherence in black holes limits entanglement degradation.

Quantum features of spacetime can improve quantum communication protocols.

Spacetime quantum properties serve as operational resources.

Abstract

Quantum information can provide a lens for characterizing the operational implications of spacetime physics. A well-known result in this area is that quantum entanglement is degraded in the vicinity of a black hole. This result treats the black hole and its spacetime as classical. But what if these were to be treated quantum-mechanically? Here, we show that quantum coherence in black hole, and thus spacetime, degrees of freedom can limit the degradation of entanglement, thereby improving the performance of nearby quantum communication protocols. This finding indicates that quantum features of spacetime could serve as resources for quantum information processing.