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Doctoral Thesis
DOI
10.11606/T.43.2001.tde-06122013-114355
Document
Author
Full name
Augusto Massashi Horiguti
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2001
Supervisor
Committee
Piza, Antonio Fernando Ribeiro de Toledo (President)
Barranco, Antonio Vidiella
Barrios, Sara Cruz
Malta, Coraci Pereira
Pascholati, Paulo Reginaldo
Title in Portuguese
Dinâmica da decoerência com subsistemas dissipativos
Keywords in Portuguese
Decoerência
Interferometria Ramsey
Sistemas Dissipativos (banho)
Abstract in Portuguese
Apresentamos um estudo sobre o fenômeno da decoerência durante a evolução temporal de um estado atômico ao interagir com o campo eletromagnético de uma cavidade não ideal. Apresentamos um modelo em que o campo da cavidade esta acoplado a um banho externo e mostramos os efeitos dissipativos que este acoplamento pode gerar na decoerência para um sistema átomo campo. Discutimos as grandezas relevantes para analise da decoerência através de modelos analíticos e numéricos, principalmente entre os acoplamentos átomo campo e campo banho. Sugerimos que o retardamento observado no processo de decoerência seja uma característica geral em sistemas analisáveis como constituídos de três subsistemas acoplados sequencialmente, com propriedades espectrais e acoplamentos suficientemente assimétricos.
Title in English
Dynamics of decoherence with dissipative subsystems
Keywords in English
Decoherence
Dissipative systems (\"bath\")
Ramsey interferometry
Abstract in English
We present a study of the phenomenon of decoherence in the time evolution of an atomic state with the electromagnetic field of a non-ideal cavity. We present a model where the cavity field is coupled to an external bath and show the dissipative effects this coupling can generate in the decoherence of the atom field system. We discuss the relevant variables for the analysis of decoherence in terms of analytic and numerical models, especially the atom-field and field-bath couplings. We suggest that the observed hindrance of the decoherence process may be a general property in systems which can be considered as formed by three subsystems coupled sequentially, with spectral properties and sufficiently asymmetric coupling.
 
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Publishing Date
2014-02-19
 
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