Spin Entanglement Witness for Quantum Gravity

Bose, Sougato, Mazumdar, Anupam, Morley, Gavin W., Ulbricht, Hendrik, Toroš, Marko, Paternostro, Mauro, Geraci, Andrew A., Barker, Peter F., Kim, M. S. and Milburn, Gerard (2017) Spin Entanglement Witness for Quantum Gravity. Physical Review Letters, 119 24: 1-6. doi:10.1103/PhysRevLett.119.240401


Author Bose, Sougato
Mazumdar, Anupam
Morley, Gavin W.
Ulbricht, Hendrik
Toroš, Marko
Paternostro, Mauro
Geraci, Andrew A.
Barker, Peter F.
Kim, M. S.
Milburn, Gerard
Title Spin Entanglement Witness for Quantum Gravity
Journal name Physical Review Letters   Check publisher's open access policy
ISSN 1079-7114
0031-9007
1092-0145
Publication date 2017-12-13
Year available 2017
Sub-type Article (original research)
DOI 10.1103/PhysRevLett.119.240401
Open Access Status Not yet assessed
Volume 119
Issue 24
Start page 1
End page 6
Total pages 6
Place of publication College Park, United States
Publisher American Physical Society
Language eng
Subject 3100 Physics and Astronomy
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.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mathematics and Physics
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Created: Sat, 06 Jan 2018, 08:09:48 EST