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Limits on inference of gravitational entanglement
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Ma, Yue, Guff, Thomas, Morley, Gavin W., Pikovski, Igor and Kim, M. S. (2022) Limits on inference of gravitational entanglement. Physical Review Research, 4 (1). 013024 . doi:10.1103/physrevresearch.4.013024 ISSN 2643-1564.
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Official URL: https://doi.org/10.1103/PhysRevResearch.4.013024
Abstract
Combining gravity with quantum mechanics remains one of the biggest challenges of physics. In the past years, experiments with optomechanical systems have been proposed that may give indirect clues about the quantum nature of gravity. In a recent variation of such tests [Carney et al., PRX Quantum 2, 030330 (2021)], the authors propose to gravitationally entangle an atom interferometer with a mesoscopic oscillator. The interaction results in periodic drops and revivals of the interferometeric visibility, which under specific assumptions indicate the gravitational generation of entanglement. Here, we study semiclassical models of the atom interferometer that can reproduce the same effect. We show that the core signature—periodic collapses and revivals of the visibility—can appear if the atom is subject to a random unitary channel, including the case where the oscillator is fully classical and situations even without explicit modeling of the oscillator. We also show that the nonclassicality of the oscillator vanishes unless the system is very close to its ground state, and even when the system is in the ground state, the nonclassicality is limited by the coupling strength. Our results thus indicate that deducing entanglement from the proposed experiment is very challenging, since fulfilling and verifying the nonclassicality assumptions constitute a significant challenge in their own right.
| Item Type: | Journal Article | ||||||
|---|---|---|---|---|---|---|---|
| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||
| SWORD Depositor: | Library Publications Router | ||||||
| Journal or Publication Title: | Physical Review Research | ||||||
| Publisher: | American Physical Society (APS) | ||||||
| ISSN: | 2643-1564 | ||||||
| Official Date: | 10 January 2022 | ||||||
| Dates: |
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| Volume: | 4 | ||||||
| Number: | 1 | ||||||
| Article Number: | 013024 | ||||||
| DOI: | 10.1103/physrevresearch.4.013024 | ||||||
| Status: | Peer Reviewed | ||||||
| Publication Status: | Published | ||||||
| Access rights to Published version: | Open Access (Creative Commons) | ||||||
| Copyright Holders: | © 2022 American Physical Society | ||||||
| Date of first compliant deposit: | 22 February 2022 | ||||||
| Date of first compliant Open Access: | 22 February 2022 | ||||||
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