Classical gravity cannot mediate entanglement

TL;DR

This paper critically examines a recent claim that classical gravity can produce entanglement, arguing that such claims are unfounded and that entanglement would indicate quantum properties of gravity.

Contribution

The paper refutes a recent model claiming classical gravity can generate entanglement and clarifies that genuine gravitational entanglement would demonstrate gravity's quantum nature.

Findings

The model does not produce entanglement.

Entanglement, if observed, would indicate quantum gravity.

Classical gravity cannot mediate entanglement.

Abstract

In Nature, 646, 813 (2025), Aziz and Howl claim that classical (unquantised) gravity produces entanglement. We show that their model does not produce entanglement. Even if the model produced entanglement, it would be mediated by the quantised matter interaction, and not gravity. Hence entanglement mediated by gravity remains an unambiguous witness of gravity's quantum features.