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This is a Experimental Study study.

October 13, 2025Open Access

Testing the quantum nature of gravity through interferometry

Key Points

The protocol reveals a clear binary signature for measuring the quantum nature of gravity.
Results demonstrate effective testing of Schrodinger-Newton theory with a signal-to-noise ratio after 3 hours of data collection.
Employing squeezed input states enhances measurement accuracy in quantum gravity experiments.
Findings indicate that gravity can be subjected to quantum mechanical testing in controlled environments.

Abstract

We propose a Michelson-type interferometric protocol for testing the quantum nature of gravity through testing the phenomenology of semi-classical gravity theory, which predicts a state-dependent Schrodinger-Newton (SN) evolution of the test mass. The protocol's feature lies in utilizing the asymmetry of two interferometric arms induced by SN self-gravity to create cross-talk between the common and differential motion of the test masses. This cross-talk is imprinted as a clean binary signature in the correlation measurements of the interferometer's output light fields. Our results demonstrate that, when assisted by 10 dB squeezed input states, 3 hours of aggregated measurement data can provide sufficient signal-to-noise ratio to conclusively test the SN theory in 1 Kelvin environment. This shows the strong feasibility of using such interferometric protocols to test if gravity operates quantum-mechanically.

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Cite This Study

Liu et al. (Mon,) studied this question.

synapsesocial.com/papers/68ec51df42911f61ef8b1fc4 https://doi.org/https://doi.org/10.48550/arxiv.2506.13085

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