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Spin Entanglement Witness for Quantum Gravity

Bose, S; Mazumdar, A; Morley, GW; Ulbricht, H; Toros, M; Paternostro, M; Geraci, AA; ... Milburn, G; + view all (2017) Spin Entanglement Witness for Quantum Gravity. Physical Review Letters , 119 (24) , Article 240401. 10.1103/PhysRevLett.119.240401. Green open access

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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.

Type: Article
Title: Spin Entanglement Witness for Quantum Gravity
Open access status: An open access version is available from UCL Discovery
DOI: 10.1103/PhysRevLett.119.240401
Publisher version: http://doi.org/10.1103/PhysRevLett.119.240401
Language: English
Additional information: © 2017 American Physical Society. This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Science & Technology, Physical Sciences, Physics, Multidisciplinary, Physics, DECOHERENCE, REDUCTION, MODELS
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy
URI: https://discovery.ucl.ac.uk/id/eprint/10040779
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