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Quantum Gravity Relativistic Quantum Information

Repulsive Gravitational Force as a Witness of the Quantum Nature of Gravity

arXiv
Authors: Pablo L. Saldanha, Chiara Marletto, Vlatko Vedral

Year

2026

Paper ID

56

Status

Preprint

Abstract Read

~2 min

Abstract Words

116

Citations

N/A

Abstract

We show that a single spatially superposed 'source' mass acting on a 'probe' matter wavepacket can reveal the quantum nature of the gravitational field. For this we use a specific state preparation and measurement of the superposed source mass, including a postselection, which altogether results in a repulsive gravitational force on the probe particle. A classical gravitational field can never lead to repulsion, as the effect requires quantum interference of two distinct states of gravity. We also present a calculation in the Heisenberg picture under the formalism of weak values that illustrates how repulsion is achieved. Finally, we estimate the range of parameters (masses and the spatio-temporal extent of interference) for which the experiment is feasible.

Why This Paper Matters

  • This paper contributes to the Quantum Gravity & Relativistic Quantum Information research area in the Quantum Articles archive.
  • It adds a 2026 reference point for readers tracking recent quantum research.
  • We show that a single spatially superposed 'source' mass acting on a 'probe' matter wavepacket can reveal the quantum nature of the gravitational field.

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References & Citation Signals

[1] DOI https://doi.org/arXiv:2602.12266 [2] arXiv https://arxiv.org/abs/2602.12266 [3] Publisher https://arxiv.org/abs/2602.12266

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