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Entanglement based observables for quantum impurities

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2022

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Sack, Stefan H.
Ferguson, Michael S.

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Physical Review Research. American Physical Society. 2022, 4(4), 043177. eISSN 2643-1564. Available under: doi: 10.1103/PhysRevResearch.4.043177

Zusammenfassung

Quantum impurities 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 harness 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 by exactly solving the open Kondo box model in the small box limit, and thus describe all-electronic dot-cavity devices. Specifically, we conclusively characterise the 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. Furthermore, we propose an experimentally feasible tomography protocol for the measurement of the purity, which motivates the observation of impurity physics through their entanglement build-up.

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ISO 690STOCKER, Lidia, Stefan H. SACK, Michael S. FERGUSON, Oded ZILBERBERG, 2022. Entanglement based observables for quantum impurities. In: Physical Review Research. American Physical Society. 2022, 4(4), 043177. eISSN 2643-1564. Available under: doi: 10.1103/PhysRevResearch.4.043177
BibTex
@article{Stocker2022-01-19T08:08:35ZEntan-59817,
  year={2022},
  doi={10.1103/PhysRevResearch.4.043177},
  title={Entanglement based observables for quantum impurities},
  number={4},
  volume={4},
  journal={Physical Review Research},
  author={Stocker, Lidia and Sack, Stefan H. and Ferguson, Michael S. and Zilberberg, Oded},
  note={Article Number: 043177}
}
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