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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
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 | |||||||||||||||||||||||||||||||||||||||||||||
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| 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 | |||||||||||||||||||||||||||||||||||||||||||||
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| 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 | |||||||||||||||||||||||||||||||||||||||||||||
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