Searching for Signatures of Quantum Gravity in Quantum Gases

TL;DR

This paper investigates the potential to detect quantum properties of gravity using ultra-cold atoms, proposing a method that could distinguish quantum gravitational effects from classical ones with feasible experimental improvements.

Contribution

It introduces a novel approach employing multi-parameter estimation with ultra-cold atoms to identify quantum signatures of gravity, surpassing previous two-particle schemes.

Findings

Quantum interactions can produce observable signatures distinct from classical gravity.

Preparation of specific initial states enhances the detectability of quantum gravitational effects.

Experimental detection is challenging but potentially achievable with moderate technological improvements.

Abstract

We explore the possibility of testing the quantum nature of the gravitational field with an ensemble of ultra-cold atoms. The use of many microscopic particles may circumvent some of the experimental obstacles encountered in recent proposals involving a pair of particles with mesoscopic mass. We employ multi-parameter estimation techniques, including the quantum and classical Fisher information to provide a criteria for the observability of the quantum effects, and compare to other recently proposed schemes. Crucially, we find that by preparing the appropriate initial state, interactions mediated via a quantum-valued gravitational field provide a signature that is distinct from classical gravitational interactions. We find that a test with ultra-cold atoms would be challenging, but not implausible with moderate improvements to current experimental techniques.