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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Two coupled qubits interacting with a thermal bath: A comparative study of different models

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Autor(es):
Decordi, G. L. ; Vidiella-Barranco, A.
Número total de Autores: 2
Tipo de documento: Artigo Científico
Fonte: Optics Communications; v. 387, p. 366-376, MAR 15 2017.
Citações Web of Science: 8
Resumo

We investigate the dynamics of two interacting two-level systems (qubits) having one of them isolated and the other coupled to a large number of modes of the quantized electromagnetic field (thermal reservoir). We consider two different models of system-reservoir interaction: (i) a ``microscopic{''} model, according to which the corresponding master equation is derived taking into account the interaction between the two subsystems (qubits); (ii) a naive ``phenomenological{''} model, in which such interaction is neglected in the derivation of the master equation. We study the dynamics of quantities such as bipartite entanglement, quantum discord and the linear entropy of the isolated qubit in both the strong and weak coupling regimes of the inter-qubit interaction. We also consider different temperatures of the reservoir. We find significant disagreements between the results obtained from the two models even in the weak coupling regime. For instance, we show that according to the phenomenological model, the isolated qubit would approach a maximally mixed state more slowly for higher temperatures (unphysical result), while the microscopic model predicts the opposite behaviour (correct result). (AU)

Processo FAPESP: 08/57856-6 - Instituto Nacional de Ciência e Tecnologia em Informação Quântica
Beneficiário:Amir Ordacgi Caldeira
Linha de fomento: Auxílio à Pesquisa - Temático
Processo FAPESP: 05/51689-2 - Centro de Pesquisa em Óptica e Fotônica - UNICAMP (CEPOF-UNICAMP)
Beneficiário:Hugo Luis Fragnito
Linha de fomento: Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs