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

Roman Schnabel
Phys. Rev. A 92, 012126 – Published 28 July 2015
Physics logo See Synopsis: Entangled Mirrors Could “Reflect” Quantum Gravity

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 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 (nonrelativistic) 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 center-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.

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  • Received 5 May 2015

DOI:https://doi.org/10.1103/PhysRevA.92.012126

©2015 American Physical Society

Synopsis

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Entangled Mirrors Could “Reflect” Quantum Gravity

Published 28 July 2015

A proposed interferometry experiment could test nonrelativistic quantum gravity theories by entangling two mirrors weighing as much as apples.

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Authors & Affiliations

Roman Schnabel*

  • Institut für Laserphysik and Zentrum für Optische Quantentechnologien, Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany and Institut für Gravitationsphysik, Leibniz Universität Hannover and Max-Planck-Institut für Gravitationsphysik (Albert-Einstein-Institut), Callinstraße 38, 30167 Hannover, Germany

  • *Corresponding author: roman.schnabel@physnet.uni-hamburg.de

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Issue

Vol. 92, Iss. 1 — July 2015

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