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Spin Entanglement Witness for Quantum Gravity

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Title: Spin Entanglement Witness for Quantum Gravity
Authors: Bose, S
Mazumdar, A
Morley, GW
Ulbricht, H
Toros, M
Paternostro, M
Geraci, AA
Barker, PF
Kim, MS
Milburn, G
Item Type: Journal Article
Abstract: Understanding gravity in the framework of quantum mechanics is one of the great challenges in modern physics. However, the lack of empirical evidence has lead to a debate on whether gravity is a quantum entity. Despite varied proposed probes for quantum gravity, it is fair to say that there are no feasible ideas yet to test its quantum coherent behavior directly in a laboratory experiment. Here, we introduce an idea for such a test based on the principle that two objects cannot be entangled without a quantum mediator. We show that despite the weakness of gravity, the phase evolution induced by the gravitational interaction of two micron size test masses in adjacent matter-wave interferometers can detectably entangle them even when they are placed far apart enough to keep Casimir-Polder forces at bay. We provide a prescription for witnessing this entanglement, which certifies gravity as a quantum coherent mediator, through simple spin correlation measurements.
Issue Date: 13-Dec-2017
Date of Acceptance: 6-Sep-2017
URI: http://hdl.handle.net/10044/1/55797
DOI: https://dx.doi.org/10.1103/PhysRevLett.119.240401
ISSN: 0031-9007
Publisher: American Physical Society
Journal / Book Title: Physical Review Letters
Volume: 119
Issue: 24
Copyright Statement: © 2017 American Physical Society
Sponsor/Funder: Engineering & Physical Science Research Council (E
The Leverhulme Trust
The Royal Society
Funder's Grant Number: EP/K034480/1
Keywords: Science & Technology
Physical Sciences
Physics, Multidisciplinary
02 Physical Sciences
General Physics
Publication Status: Published
Article Number: 240401
Appears in Collections:Quantum Optics and Laser Science
Faculty of Natural Sciences