Einstein-Podolsky-Rosen - entangled motion of two massive objects

TL;DR

This paper proposes a feasible experimental setup using a Michelson interferometer with two cooled, high-quality mirrors to generate and verify EPR-entangled motion of massive objects, enabling tests of quantum mechanics and gravity at macroscopic scales.

Contribution

It introduces a specific interferometer design with two kilogram-scale mirrors for generating and testing EPR entanglement in macroscopic objects, advancing experimental quantum gravity research.

Findings

Design of a Michelson interferometer with entangled massive mirrors

Feasibility of generating EPR-entangled motion at kilogram scale

Potential to test quantum mechanics and gravity theories

Abstract

In 1935, Einstein, Podolsky and Rosen (EPR) considered two particles in an entangled state of motion to illustrate why they questioned the completeness of quantum theory. In the past decades, microscopic systems with entanglement in various degrees of freedom have successfully been generated, representing compelling evidence to support the completeness of quantum theory. Today, the generation of an EPR-entangled state of motion of two massive objects of up to the kilogram-scale seems feasible with state-of-the-art technology. Recently, the generation and verification of EPR-entangled mirror motion in interferometric gravitational wave detectors was proposed, with the aim of testing quantum theory in the regime of macroscopic objects, and to make available nonclassical probe systems for future tests of modified quantum theories that include (non-relativistic) gravity. The work presented here builds on these earlier results and proposes a specific Michelson interferometer that includes two high-quality laser mirrors of about 0.1 kg mass each. The mirrors are individually suspended as pendula and located close to each other, and cooled to about 4 K. The physical concepts for the generation of the EPR-entangled centre of mass motion of these two mirrors are described. Apart from a test of quantum mechanics in the macroscopic world, the setup is envisioned to test predictions of yet-to-be-elaborated modified quantum theories that include gravitational effects.