  It is believed that gravity can be considered as a quantum coherent mediator.
In this study, we propose a plan to test the existence of extra dimensions
using the Quantum Gravity Induced Entanglement of Masses (QGEM) experiment.
This experiment involves two freely falling test masses passing through a
Stern-Gerlach-like device. We investigate the entanglement witness between
these masses within the framework of the Randall-Sundrum II model (RS-II). Our
findings indicate that the system reaches entanglement more rapidly in the
presence of extra dimensions, particularly when the radius of the extra
dimension is large.
