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Enhancing violations of Leggett-Garg inequalities in nonequilibrium correlated many-body systems by interactions and
J J Mendoza-Arenas1, F J Gómez-Ruiz2,3, F J Rodríguez1
1Departamento de Física, Universidad de los Andes, A.A. 4976, Bogotá, D. C., Colombia.
Abstract:
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.
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