Locally mediated entanglement in linearized quantum gravity

Marios Christodoulou, Andrea Di Biagio, Markus Aspelmeyer, Caslav Brukner, Carlo Rovelli, Richard Howl

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The current interest in laboratory detection of entanglement mediated by gravity was sparked by an information-theoretic argument: entanglement mediated by a local field certifies that the field is not classical. Previous derivations of the effect modeled gravity as instantaneous; here we derive it from linearized quantum general relativity while keeping Lorentz invariance explicit, using the path-integral formalism. In this framework, entanglement is clearly mediated by a quantum feature of the field. We also point out the possibility of observing “retarded” entanglement, which cannot be explained by an instantaneous interaction. This is a difficult experiment for gravity, but is plausible for the analogous electromagnetic case.
Original languageEnglish
JournalPhysical Review Letters
Issue number10
Publication statusPublished - 10 Mar 2023

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