Abstract
Using Bell inequalities as a tool to explore non-classical physical behaviours, in this paper we analyse what one can expect to find in many-body quantum physics. Concretely, framing the usual correlation scenarios as a concrete spin lattice, we want to know whether or not it is possible to violate a Bell inequality restricted to this scenario. Using clustering theorems, we are able to show that a large family of quantum many-body systems behave almost-locally, violating Bell inequalities (if so) only by a non-significant amount. We also provide examples, explain some of our assumptions via counter-examples and present all the proofs for our results. We hope the paper is self-contained.



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Change history
11 January 2022
A Correction to this paper has been published: https://doi.org/10.1007/s13538-021-01040-0
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Acknowledgements
Many thanks to R. Rabelo for all the stimulating discussion.
Funding
This paper is a result of the Brazilian National Institute of Science and Technology on Quantum Information. This work is supported by the Brazilian agencies Conselho Nacional de Desenvolvimento Científico e Tecnológico, Coordenação de Aperfeiçoamento de Pessoal de Nível Superior, FAEPEX, and by the National Research, Development and Innovation Office of Hungary (NKFIH) through the Quantum Information National Laboratory of Hungary and through the grant FK 135220. This project/research was supported by grant number FQXi-RFP-IPW-1905 from the Foundational Questions Institute and Fetzer Franklin Fund, a donor advised fund of Silicon Valley Community Foundation. CD was supported by a fellowship from the Grand Challenges Initiative at Chapman University.
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Vieira, C.H.S., Duarte, C., Drumond, R.C. et al. Bell Non-Locality in Many-Body Quantum Systems with Exponential Decay of Correlations. Braz J Phys 51, 1603–1616 (2021). https://doi.org/10.1007/s13538-021-00998-1
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DOI: https://doi.org/10.1007/s13538-021-00998-1