Possibility of detecting gravity of an object frozen in a spatial superposition by the Zeno effect

TL;DR

This paper proposes a method to detect gravity from a mass in a quantum superposition by using the Zeno effect to prevent decoherence, with feasibility estimates provided.

Contribution

It introduces a novel approach to maintain a delocalized mass state using the Zeno effect to enable gravity detection in quantum superpositions.

Findings

Feasibility estimates for parameters needed to implement the proposal.

The Zeno effect can potentially preserve superpositions against decoherence.

The approach avoids the need for entanglement preservation.

Abstract

While quantum probes surely feel gravity, no source of gravity has been prepared in a delocalized quantum state yet. Two basic questions need to be addressed: how to delocalize a mass sufficiently large to generate detectable gravity; and, once that state has been prepared, how to fight localization by decoherence. We propose to fight decoherence by freezing the source in the desired state through the Zeno effect. Successful implementation can be verified by scattering a probe in the effective potential generated by the source. Besides putting forward the idea, we provide an estimation of the values of the parameters required for the proposal to be feasible. Overall, the proposal seems as challenging as other existing ones, although the specific challenges are different (e.g. no entanglement needs to be preserved or detected, but the Zeno freezing must be implemented).