Violation of Leggett—Garg inequalities for quantum-classical hybrids

[摘要] Violation of Leggett-Garg inequalities can serve as a signature of a failure of (macroscopic) realism. We investigate violation of the simplest Leggett-Garg inequality for a qubit coupled to an integer j spin (angular momentum). Such a system effectively reveals quantum-classical hybrid behavior in the limit of large j values. We show that a maximal violation of the Leggett- Garg inequality is larger for quantum-classical hybrids than for fully quantum systems.

[发布机构] Institute of Physics, University of Silesia, Katowice, Poland^1;Silesian Center for Education and Interdisciplinary Research, University of Silesia, Chorzów, Poland^2

[效力级别] 力学 [学科分类] 力学，机械学

[关键词] Hybrid behavior;J value;Quantum system;Quantum-classical