Please use this identifier to cite or link to this item: http://repositorio.ufla.br/jspui/handle/1/58871
Title: Thermal entanglement and quantum coherence of a single electron in a double quantum dot with Rashba interaction
Keywords: Thermal quantum coherence
Rashba interaction
Double quantum dot
Thermal entanglement
Quantum coherence
Issue Date: 2023
Publisher: American Physical Society
Citation: FERREIRA, M.; ROJAS, O.; ROJAS, M. Thermal entanglement and quantum coherence of a single electron in a double quantum dot with Rashba interaction. Physical Review A, [S.l.], 2023.
Abstract: In this work, we study the thermal quantum coherence and fidelity in a two-level system with spin-orbit coupling. The proposed model involves a single electron in a double quantum dot with Rashba spin-orbit coupling in the presence of an external magnetic field. In our scenario, the thermal entanglement of the single electron is driven by the charge and spin qubits, the latter controlled by Rashba coupling. Analytical expressions are obtained for thermal concurrence and correlated coherence using the density matrix formalism. The main goal of this work is to provide a good understanding of the effects of temperature and several parameters in quantum coherence. In addition, our findings show that we can use the Rashba coupling to tune the thermal entanglement, quantum coherence, and the thermal fidelity behavior of the system. Moreover, we focus on the role played by thermal entanglement and correlated coherence responsible for quantum correlations. We observe that the correlated coherence is more robust than the thermal entanglement in all cases, so quantum algorithms based only on correlated coherence may be stronger than those based on entanglement.
URI: https://journals.aps.org/pra/abstract/10.1103/PhysRevA.107.052408
http://repositorio.ufla.br/jspui/handle/1/58871
Appears in Collections:DEX - Artigos publicados em periódicos

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