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@article{Bose:2017:10.1103/PhysRevLett.119.240401,
author = {Bose, S and Mazumdar, A and Morley, GW and Ulbricht, H and Toros, M and Paternostro, M and Geraci, AA and Barker, PF and Kim, MS and Milburn, G},
doi = {10.1103/PhysRevLett.119.240401},
journal = {Physical Review Letters},
title = {Spin Entanglement Witness for Quantum Gravity},
url = {http://dx.doi.org/10.1103/PhysRevLett.119.240401},
volume = {119},
year = {2017}
}

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TY  - JOUR
AB  - 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.
AU  - Bose,S
AU  - Mazumdar,A
AU  - Morley,GW
AU  - Ulbricht,H
AU  - Toros,M
AU  - Paternostro,M
AU  - Geraci,AA
AU  - Barker,PF
AU  - Kim,MS
AU  - Milburn,G
DO  - 10.1103/PhysRevLett.119.240401
PY  - 2017///
SN  - 0031-9007
TI  - Spin Entanglement Witness for Quantum Gravity
T2  - Physical Review Letters
UR  - http://dx.doi.org/10.1103/PhysRevLett.119.240401
UR  - http://hdl.handle.net/10044/1/55797
VL  - 119
ER  -

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Professor Myungshik Kim

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