Spin Entanglement Witness for Quantum Gravity
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Authors
Bose, Sougato
Mazumdar, Anupam
Morley, Gavin W.
Ulbricht, Hendrik
Toros, Marko
Paternostro, Mauro
Geraci, Andrew A.
Barker, Peter F.
Kim, M. S.
Milburn, Gerard
Issue Date
2017
Type
Article
Language
Keywords
decoherence , models , reduction
Alternative Title
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.
Description
Citation
Bose, S., Mazumdar, A., Morley, G. W., Ulbricht, H., Toroš, M., Paternostro, M., … Milburn, G. (2017). Spin Entanglement Witness for Quantum Gravity. Physical Review Letters, 119(24). doi:10.1103/physrevlett.119.240401
Publisher
License
In Copyright (All Rights Reserved)
Journal
Volume
Issue
PubMed ID
ISSN
0031-9007