# Quantum correlation of light mediated by gravity

## TL;DR

This paper proposes a tabletop experiment to test the quantum nature of gravity by observing squeezing in light correlations between two optomechanical cavities, linking gravity's quantumness to measurable optical effects.

## Contribution

It introduces a novel scheme to detect quantum gravity effects through light correlation squeezing in optomechanical systems, advancing experimental approaches in quantum gravity research.

## Key findings

- Squeezing remains nonzero if gravity is quantum in the Newtonian limit.
- Squeezing increases as the mechanical properties of mirrors improve.
- The scheme offers a systematic way to test quantum gravity experimentally.

## Abstract

We propose to explore the quantum nature of gravity using the correlation of light between two optomechanical cavities, and the quantumness of the correlation is witnessed by squeezing. As long as the gravity between the end mirrors of two cavities is quantum in the Newtonian limit, we show that the squeezing is always nonzero and monotonically increases as the mechanical property of the mirrors is improved. The proposed scheme provides a new pathway for testing the quantum nature of gravity systematically with tabletop experiments.