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Quantum Physics
Title: Inference of gravitational field superposition from quantum measurements
(Submitted on 6 Sep 2022 (v1), last revised 17 Oct 2023 (this version, v3))
Abstract: Experiments are beginning to probe the interaction of quantum particles with gravitational fields beyond the uniform-field regime. In non-relativistic quantum mechanics, the gravitational field in such experiments can be written as a superposition state. We empirically demonstrate that alternative theories of gravity can avoid gravitational superposition states only by decoupling the gravitational field energy from the quantum particle's time evolution. Furthermore, such theories must specify a preferred quantum reference frame in which the equations of motion are valid. To the extent that these properties are theoretically implausible, recent experiments provide indirect evidence that gravity has quantum features. Proposed experiments with superposed gravitational sources would provide even stronger evidence that gravity is nonclassical.
Submission history
From: Christopher Overstreet [view email][v1] Tue, 6 Sep 2022 04:37:07 GMT (647kb,D)
[v2] Wed, 11 Jan 2023 19:13:10 GMT (639kb,D)
[v3] Tue, 17 Oct 2023 15:39:25 GMT (640kb,D)
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