Pairwise quantum correlations in four-level quantum dot systems
| Autor: | Sanaa Abaach, Mustapha Faqir, Morad El Baz |
|---|---|
| Přispěvatelé: | Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique (LERMA (UMR_8112)), Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-CY Cergy Paris Université (CY) |
| Rok vydání: | 2021 |
| Předmět: |
FOS: Physical sciences
General Physics and Astronomy Quantum entanglement 01 natural sciences Fermi-Hubbard model 010305 fluids & plasmas Entanglement Quantum mechanics 0103 physical sciences Coulomb Quantum information 010306 general physics Quantum Quantum tunnelling [PHYS]Physics [physics] Physics Quantum Physics Quantum dots Lower bound of concurrence Condensed Matter::Mesoscopic Systems and Quantum Hall Effect Mutual information Quantum coherence Quantum dot [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph] Quantum Physics (quant-ph) Ground state Coherence (physics) |
| Zdroj: | Physics Letters A Physics Letters A, Elsevier, 2021, 391, pp.127140. ⟨10.1016/j.physleta.2021.127140⟩ |
| ISSN: | 0375-9601 1873-2429 |
| DOI: | 10.1016/j.physleta.2021.127140 |
| Popis: | International audience; In this paper we assume quantum dots can be assimilated to Fermi Hubbard sites when the Coulomb interaction between electrons is higher compared to their tunneling. The study of pairwise entanglement in a small size array of quantum dots allows to model each pair as a quadrit-quadrit system (4 × 4 mixed state) instead of the more common and simplistic approach of describing it in quantum information as a qubit-qubit system. We study the effect of Coulomb interaction and temperature on pairwise entanglement as well as on quantum coherence and total correlations. The crucial results of this study are that entanglement resists better the increase in temperature when the Coulomb interaction is stronger. Moreover, we successfully explain the behavior of these correlations in terms of the energy spectrum, namely the ground state degeneracy and the state energy difference. |
| Databáze: | OpenAIRE |
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