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Spin squeezing em núcleos quadrupolares em ressonância magnética nuclear e Hamiltonianos de One-Axis Twisting com adição de termo do tipo interação dipolar / Spin squeezing in quadrupolar nucleiin nuclear magnectic ressonance and one-Axis Twisting Hamiltonians with addition of a dipole-like interaction termOliveira, André Gustavo de 26 February 2018 (has links)
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Previous issue date: 2018-02-26 / Neste trabalho são analisados os efeitos da adição de um termo de acoplamento baseado na interação dipolar entre núcleos quadrupolares em RMN na produção de spin squeezing através de Hamiltonianos de One-Axis Twisting. Diversos regimes de acoplamento são abordados para o caso de subsistemas com momento angular I=7/2 e J=3/2. Verifica-se através das dinâmicas abordadas e pelos valores mínimos do parâmetro de spin squeezing _S^2 em função da intensidade do acoplamento D que, apesar de mudanças significativas nas dinâmicas, estados spin squeezed ainda são encontrados durante as evoluções / In this work, are analyzed the effects of the addition of a coupling term based on the dipole interaction between quadrupolar nuclei in NMR in the production of spin squeezing through One-Axis Twisting Hamiltonians. Several coupling regimes are addressed in the case of subsystems with angular momentum I = 7/2 and J = 3/2. It is verified through the dynamics addressed and by the minimum values of the spin squeezing parameter _S^2 as a function of the coupling intensity D that, despite significant changes in the dynamics, spin squeezed states are still encountered during the evolutions
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