Enhancing violations of Leggett-Garg inequalities in nonequilibrium correlated many-body systems by interactions and decoherence

We identify different schemes to enhance the violation of Leggett-Garg inequalities in open many-body systems. Considering a nonequilibrium archetypical setup of quantum transport, we show that particle interactions control the direction and amplitude of maximal violation, and that in the strongly-i...

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Bibliographic Details
Published in:Scientific reports 2019-11, Vol.9 (1), p.17772-8, Article 17772
Main Authors: Mendoza-Arenas, J J, Gómez-Ruiz, F J, Rodríguez, F J, Quiroga, L
Format: Article
Language:English
Subjects:
Phase transitions
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Summary:We identify different schemes to enhance the violation of Leggett-Garg inequalities in open many-body systems. Considering a nonequilibrium archetypical setup of quantum transport, we show that particle interactions control the direction and amplitude of maximal violation, and that in the strongly-interacting and strongly-driven regime bulk dephasing enhances the violation. Through an analytical study of a minimal model we unravel the basic ingredients to explain this decoherence-enhanced quantumness, illustrating that such an effect emerges in a wide variety of systems.
ISSN:2045-2322
2045-2322
DOI:10.1038/s41598-019-54121-1