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Testing the nonclassicality of spacetime: what can we learn from Bell-Bose et al.-Marletto-Vedral experiments?

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arxiv 2109.02616 v3 pith:5BA46VYN submitted 2021-09-06 quant-ph gr-qc

Adrian Kent , Damián Pitalúa-García This is my paper
classification quant-phgr-qc
keywords experimentspacetimebellboseentanglementgeneratedlettlhvts
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The Bose et al.-Marletto-Vedral (BMV) experiment [S. Bose et al., Phys. Rev. Lett. 119, 240401 (2017); C. Marletto and V. Vedral, Phys. Rev. Lett. 119, 240402 (2017)] aims to prove that spacetime is nonclassical by observing entanglement generated by gravity. However, local hidden variable theories (LHVTs) can simulate the entangled correlations. We propose to extend the entanglement generated by the BMV experiment to distant quantum particles in a Bell experiment. Violating a Bell inequality would rule out LHVTs, providing a stronger proof of the nonclassicality of spacetime than the BMV proposal.

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  1. Bose-Marletto-Vedral experiment without observable spacetime superpositions

    quant-ph 2025-06 conditional novelty 6.0 of 10

    Locally classical mediators with non-locally tomographic couplings can generate entanglement, so the BMV experiment does not by itself prove spacetime is quantum.

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