Nonlinear Hamiltonians
Mostrando 1-6 de 6 artigos, teses e dissertações.
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1. PROPRIEDADES ÓPTICAS NÃO LINEARES DE CLUSTERS DO BC5
The first (β) and second (γ) hyperpolarizabilities of BC5 clusters were investigated through the PM6, PM3, and MNDO-d semiempirical Hamiltonians. The Im2, Imm2, P3m1, and P phases that are pointed out in literature as likely candidates of the BC5 superhard diamondlike real structure were investigated. In this way, the stability analysis of the BC5 clusters
Quím. Nova. Publicado em: 2016-08
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2. Superradiance pulse manipulation via atomic interactions / Manipulação do pulso superradiante via interações atômicas
O fenômeno da superradiância é caracterizado por um processo de ordenamento das transições dos dipolos atômicos em amostras excitadas, moderadamente densas, decorrente das correlações induzidas entre os átomos desenvolvidas pela radiação coerente emitida pelos próprios átomos. O processo superradiante que é iniciado a partir de uma total desord
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 28/02/2012
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3. Estudo das técnicas de obtenção de Hamiltonianos efetivos em Óptica Quântica
In the Quantum Optics area, the construction of effective hamiltonian is a matter of great importance, since from them we can generate and manipulate quantum states and logical operations. In this work we discuss 3 approximate methods for obtaining such effective hamiltonians: i) adiabatic elimination, ii) method of effective dynamics for oscillating hamilto
Publicado em: 2009
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4. Um modelo consistente para o processo de fotocontagem contínua e medidas de emaranhamento de sistemas quânticos de variáveis contínuas.
This dissertation embraces two trends of research in modern quantum optics. The first of them is connected to the photodetection theory, particularly to the continuous measurement theory developed by Srinivas and Davies (SD) in 1980s, whose principal ingredient is the correct choice of the quantum jump superoperator. We deduce from first principles diff
Publicado em: 2005
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5. Squeezing in coupled oscillators having neither nonlinear terms nor time-dependent parameters
The occurrence of squeezing effects in coupled oscillators, and the transference between them, has been studied in various situations using Hamiltonians involving either nonlinear terms or time-dependent parameters. We consider a simplified scheme generating this effect, and discuss its origin.
Brazilian Journal of Physics. Publicado em: 2001-12
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6. Estudos semiclassicos na representação de estados coerentes
In this work we develop and apply a semiclassical approximation to the coherent-state propagator K(z",z ,t) = (z"iHt/h)z ), where H is the Hamilton operator for the suystem and z) represents the coherent states of the harmonic oscilator. The semiclassical K(z",z ,t) makes use of a stationary phase approxiamtion in which stationary trajectories inhabit is stu
Publicado em: 1997