Multilayer test masses to enhance the collapse noise

TL;DR

This paper proposes a layered test mass design for nanomechanical cantilever experiments to improve detection of collapse noise, a non-thermal excess noise predicted by collapse models, using current technology.

Contribution

It introduces a multilayer test mass approach to enhance collapse noise signals in nanomechanical experiments, making detection more feasible with existing technology.

Findings

Layered test masses can amplify collapse noise signals.

The method is compatible with current experimental setups.

Enhanced detection sensitivity for collapse models.

Abstract

Recently, a non-thermal excess noise, compatible with the theoretical prediction provided by collapse models, was measured in a millikelvin nanomechanical cantilever experiment [Vinante et al., Phys. Rev. Lett. 119, 110401 (2017)]. We propose a feasible implementation of the cantilever experiment able to probe such a noise. The proposed modification, completely within the grasp of current technology and readily implementable also in other type of mechanical non-interferometric experiments, consists in substituting the homogeneous test mass with one composed of different layers of different materials. This will enhance the action of a possible collapse noise above that given by standard noise sources.