Quantum Gravity Witness via Entanglement of Masses: Casimir Screening

Understand

A recently proposed experimental protocol for Quantum Gravity induced Entanglement of Masses (QGEM) requires in principle realizable, but still very ambitious, set of parameters in matter-wave interferometry.

• Motivated by easing the experimental realization, in this paper, we consider the parameter space allowed by a slightly modified experimental design, which mitigates the Casimir potential between two spherical neutral test-masses by separating the two macroscopic interferometers by a thin conducting plate.
• Although this set-up will reintroduce a Casimir potential between the conducting plate and the masses, there are several advantages of this design.
• First, the quantum gravity induced entanglement between the two superposed masses will have no Casimir background.