Entangling macroscopic diamonds at room temperature: Bounds on the continuous-spontaneous-localization parameters

TL;DR

This paper analyzes a groundbreaking experiment entangling macroscopic diamonds at room temperature, testing the limits of quantum mechanics and constraining collapse models that predict deviations from superposition.

Contribution

It provides bounds on collapse model parameters based on experimental data, comparing them with other tests and highlighting their relative strength.

Findings

Experimental bounds are weaker than matter-wave interferometry tests.

The experiment confirms quantum entanglement in macroscopic objects at room temperature.

Collapse models face tighter constraints from other non-interferometric tests.

Abstract

A recent experiment [K. C. Lee et al., Science 334, 1253 (2011)] succeeded in detecting entanglement between two macroscopic specks of diamonds, separated by a macroscopic distance, at room temperature. This impressive results is a further confirmation of the validity of quantum theory in (at least parts of) the mesoscopic and macroscopic domain, and poses a challenge to collapse models, which predict a violation of the quantum superposition principle, which is the bigger the larger the system. We analyze the experiment in the light of such models. We will show that the bounds placed by experimental data are weaker than those coming from matter-wave interferometry and non-interferometric tests of collapse models.