Sudden death of entanglement induced by a minimal thermal environment
ARTIGO
Inglês
Agradecimentos: This work was also supported by CNPq (Conselho Nacional para o Desenvolvimento Científico e Tecnológico, Brazil), through the INCT-IQ (National Institute for Science and Technology of Quantum Information), grant N 465469/2014-0, and FAPESP (Fundação de Amparo à Pesquisa do Estado de...
Agradecimentos: This work was also supported by CNPq (Conselho Nacional para o Desenvolvimento Científico e Tecnológico, Brazil), through the INCT-IQ (National Institute for Science and Technology of Quantum Information), grant N 465469/2014-0, and FAPESP (Fundação de Amparo à Pesquisa do Estado de São Paulo, Brazil) , grant N 2008/57856-6, Brazil
Abstract: We study the dynamics of two interacting two-level systems (qubits) having one of them isolated and the other coupled to a single mode electromagnetic field in a thermal state. The field plays the role of a small environment, in contrast to the usual approach of modelling an environment...
Abstract: We study the dynamics of two interacting two-level systems (qubits) having one of them isolated and the other coupled to a single mode electromagnetic field in a thermal state. The field plays the role of a small environment, in contrast to the usual approach of modelling an environment via a thermal reservoir with many degrees of freedom. We find the analytical solution of the proposed model, which allows us to investigate the consequences of the coupling to the small environment on characteristic quantum features of the two-qubit system. We study the time evolution of quantum entanglement and coherence, verifying the dependence on the relevant coupling constants as well as the influence of the effective temperature of the environment. Interestingly, we find that both sudden death and sudden birth of entanglement may occur in such a simple system. We also discuss a different partition, in which the isolated qubit is considered to be coupled to a composite environment, constituted by the other qubit plus the field mode
CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO - CNPQ
465469/2014-0
FUNDAÇÃO DE AMPARO À PESQUISA DO ESTADO DE SÃO PAULO - FAPESP
2008/57856-6
Fechado
Sudden death of entanglement induced by a minimal thermal environment
Sudden death of entanglement induced by a minimal thermal environment
Fontes
Optics communications Vol. 475 (Nov., 2020), n. art. 126233, p. 1-7 |