Locally Mediated Entanglement in Linearized Quantum Gravity

Marios Christodoulou, Andrea Di Biagio, Markus Aspelmeyer, Časlav Brukner, Carlo Rovelli, and Richard Howl
Phys. Rev. Lett. 130, 100202 – Published 10 March 2023
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Abstract

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.

  • Figure
  • Received 31 March 2022
  • Accepted 5 December 2022

DOI:https://doi.org/10.1103/PhysRevLett.130.100202

© 2023 American Physical Society

Physics Subject Headings (PhySH)

Quantum Information, Science & TechnologyGravitation, Cosmology & AstrophysicsGeneral Physics

Authors & Affiliations

Marios Christodoulou1,2, Andrea Di Biagio1,3, Markus Aspelmeyer1,2,4, Časlav Brukner1,2,4, Carlo Rovelli5,6,7, and Richard Howl8,9

  • 1Institute for Quantum Optics and Quantum Information (IQOQI) Vienna, Austrian Academy of Sciences, Boltzmanngasse 3, A-1090 Vienna, Austria
  • 2Vienna Center for Quantum Science and Technology (VCQ), Faculty of Physics, University of Vienna, Boltzmanngasse 5, A-1090 Vienna, Austria
  • 3Dipartimento di Fisica, Sapienza Università di Roma, Piazzale Aldo Moro 5, 00185 Roma, Italy
  • 4Research Platform TURIS, University of Vienna, 1090 Vienna, Austria
  • 5Aix-Marseille University, Université de Toulon, CPT-CNRS, 13009 Marseille, France
  • 6Department of Philosophy and the Rotman Institute of Philosophy, Western University, London, Ontario ON M5S 3E6, Canada,
  • 7Perimeter Institute, 31 Caroline Street North, Waterloo, Ontario ON N2L 2Y5, Canada
  • 8Quantum Group, Department of Computer Science, University of Oxford, Wolfson Building, Parks Road, Oxford, OX1 3QD, United Kingdom
  • 9QICI Quantum Information and Computation Initiative, Department of Computer Science, The University of Hong Kong, Pokfulam Road, Hong Kong

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Issue

Vol. 130, Iss. 10 — 10 March 2023

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