Searching for Signatures of Quantum Gravity in Quantum Gases

Understand

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.