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- W4225594310 abstract "Quantum impurity systems exhibit fascinating many-body phenomena when the small interacting impurity changes the physics of a large noninteracting environment. The characterisation of such strongly-correlated non-perturbative effects is particularly challenging due to the infinite size of the environment, and the inability of local correlators to capture the build-up of long-ranged entanglement in the system. Here, we devise an entanglement-based observable - the purity of the impurity - as a witness for the formation of strong correlations. We showcase the utility of our scheme when exactly solving the open Kondo box model in the small box limit, corresponding to all-electronic dot-cavity devices. Thus, we characterise the experimentally-observed metal-to-insulator phase transition in the system and identify how the (conducting) dot-lead Kondo singlet is quenched by an (insulating) intra-impurity singlet formation. Our work showcases that quantum information observables serve as excellent order parameters for the characterisation of strong correlation, and motivates experimental observation of the purity of mesoscopic devices as entanglement witnesses." @default.
- W4225594310 created "2022-05-05" @default.
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- W4225594310 date "2022-01-19" @default.
- W4225594310 modified "2023-09-26" @default.
- W4225594310 title "Solving quantum impurities with entanglement-based observables" @default.
- W4225594310 doi "https://doi.org/10.48550/arxiv.2201.07461" @default.
- W4225594310 hasPublicationYear "2022" @default.
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