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Spin entanglement witness for quantum gravity

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Bose, S., Mazumdar, A., Morley, Gavin, Ulbricht, H., Toroš, M., Paternostro, M., Geraci, A. A., Barker , P. F., Kim, M. S. and Milburn , G. (2017) Spin entanglement witness for quantum gravity. Physical Review Letters, 119 (24). 240401. doi:10.1103/PhysRevLett.119.240401

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Official URL: https://doi.org/10.1103/PhysRevLett.119.240401

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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.

Item Type: Journal Article
Subjects: Q Science > QC Physics
Divisions: Faculty of Science > Physics
Library of Congress Subject Headings (LCSH): Quantum gravity, Interferometers
Journal or Publication Title: Physical Review Letters
Publisher: American Physical Society
ISSN: 0031-9007
Official Date: 15 December 2017
Dates:
DateEvent
15 December 2017Published
13 December 2017Available
13 December 2017Accepted
Volume: 119
Number: 24
Article Number: 240401
DOI: 10.1103/PhysRevLett.119.240401
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access
RIOXX Funder/Project Grant:
Project/Grant IDRIOXX Funder NameFunder ID
RPG-2016-046Leverhulme Trusthttp://dx.doi.org/10.13039/501100000275
RPG-2014-055Leverhulme Trusthttp://dx.doi.org/10.13039/501100000275
FQXiFoundational Questions Institutehttp://dx.doi.org/10.13039/100009566
PHY-1506431National Science Foundationhttp://dx.doi.org/10.13039/100000001
[EP/K034480/1[EPSRC] Engineering and Physical Sciences Research Councilhttp://dx.doi.org/10.13039/501100000266
618074European Commissionhttp://dx.doi.org/10.13039/501100000780
UNSPECIFIEDScience Foundation Irelandhttp://dx.doi.org/10.13039/501100001602
15/IA/2864Northern Ireland. Department for the Economyhttp://viaf.org/viaf/16147121669826390974
UNSPECIFIEDRoyal Societyhttp://dx.doi.org/10.13039/501100000288
CA15220European Cooperation in Science and Technologyhttp://dx.doi.org/10.13039/501100000921
EP/M013243/1[EPSRC] Engineering and Physical Sciences Research Councilhttp://dx.doi.org/10.13039/501100000266
EP/N031105/1[EPSRC] Engineering and Physical Sciences Research Councilhttp://dx.doi.org/10.13039/501100000266
EP/K004077/1[EPSRC] Engineering and Physical Sciences Research Councilhttp://dx.doi.org/10.13039/501100000266
PACOMANE- DIAH2020 European Research Councilhttp://dx.doi.org/10.13039/100010663
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