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The multimode nature of spacetime entanglement in QFT

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arxiv 2409.16368 v1 pith:TZHZ25HA submitted 2024-09-24 quant-ph gr-qc

Ivan Agullo , Béatrice Bonga , Eduardo Martín-Martínez , Sergi Nadal-Gisbert , T. Rick Perche , José Polo-Gómez , Patricia Ribes-Metidieri , Bruno de S. L. Torres This is my paper
classification quant-phgr-qc
keywords entanglementfieldmodesmultimodeindividualspacetimequantumappears
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We demonstrate the presence of multimode entanglement in the vacuum state of a free, massless scalar quantum field in four-dimensional flat spacetime between two sets of field modes, each contained within a spacetime region that is causally disconnected from the other. This is true despite the fact that entanglement between pairs of individual field modes is sparse and appears only when the two individual modes are carefully selected. Our results reveal that, while entanglement between individual modes is limited, bipartite multimode entanglement in quantum field theory is ubiquitous. We further argue that such multimode entanglement is operationally extractable, and it forms the basis of the entanglement commonly discussed in entanglement harvesting protocols.

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Cited by 4 Pith papers

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  1. Bipartite entanglement harvesting with multiple detectors

    quant-ph 2026-04 unverdicted novelty 5.0 of 10

    Multiple Unruh-DeWitt detectors harvest more vacuum entanglement when arranged in specific configurations, with harvested negativity scaling linearly in linear chains.

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  4. Bell states for fermions in loop quantum gravity

    gr-qc 2025-08 unverdicted novelty 5.0 of 10

    In loop quantum gravity, a surface-normal fermion spin observable can be used to construct CHSH-type correlations that are violated by fermion states coupled to quantum geometry.

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