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S. A. Fulling, Aspects of Quantum Field Theory in Curved Spacetime
1989
Earlier work this paper cites.
Joseph Aziz and Richard Howl, “Classical theories of gravity produce entanglement,” Nature
2025
Earlier work this paper cites.

Similar

Zachary Weller-Davies, “Is there a ‘smoking gun’ test for quantum gravity?” Nature
2025
Cited alongside, same era.

Then

Giorgia Infantino, Anirudh Gundhi, and Angelo Bassi, “Can classical theories of gravity produce entanglement?” arXiv:2604.19696 (2026)
Original
2026
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2025

No, classical gravity does not entangle quantized matter fields

Diósi, Lajos

Understand

In their recent work, Nature, {\bf 646}, 813 (2025), Aziz and Howl claim that classical (unquantized) gravity can generate entanglement of quantized matter if matter is treated within quantum field theory which is, no doubt, our ultimate theory to use.

We show that the perturbative result of Aziz and Howl in interaction picture is inconsistent with our exact and simple non-perturbative derivation in Heisenberg picture, that fundamentally precludes the claimed entanglement.