• JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
 
  Bookmark and Share
 
 
Doctoral Thesis
DOI
https://doi.org/10.11606/T.76.2022.tde-18082022-092449
Document
Author
Full name
Adriane Consuelo Leal Auccaise
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Carlos, 2022
Supervisor
Committee
Bonagamba, Tito Jose (President)
Fanchini, Felipe Fernandes
Pinto, Diogo de Oliveira Soares
Roversi, José Antonio
Serra, Roberto Menezes
Title in Portuguese
Geração de estados gato de Schrödinger e estudo da relaxação nuclear em spins quadrupolares via RMN
Keywords in Portuguese
Cristal líquido liotrópico
Gato de Schrödinger
Relaxação Magnética Nuclear
Ressonância Magnética Nuclear
Teoria de Redfield
Abstract in Portuguese
Essa tese foi elaborada dentro do escopo da Informação Quântica, envolvendo aspectos teóricos e experimentais associados à Ressonância Magnética Nuclear. Nesse sentido, realizaram-se estudos teóricos com o intuito de descrever o formalismo da geração de estados gato de Schrödinger e apresentar o desenvolvimento matemático de relaxação nuclear, via a Teoria de Redfield. Por outro lado, os aspectos experimentais foram constituídos de implementações em um sistema de spin I = 3=2 para a geração de estados gato de Schrödinger. Por meio de tomografia de estado quântico, obtiveram-se as matrizes densidade com fidelidades acima de 0; 96. Sendo assim, funções de distribuição de quasiprobabilidade de Wigner foram geradas demonstrando padrões de interferência característicos desse tipo de estado quântico. Também, utilizou-se um sistema de spin I = 7=2 para o estudo de relaxação magnética, de modo que obtiveram-se as soluções analíticas e numéricas para todos os elementos da matriz densidade. Além disso, para aplicar as equações teóricas implementaram-se dois experimentos de Relaxação Magnética Nuclear: spineco e inversão-recuperação, determinando-se assim as densidades espectrais que caracterizam a dinâmica molecular do sistema estudado. Para ambos desenvolvimentos experimentais via RMN foram preparadas amostras de cristais líquidos liotrópicos contendo núcleos de 23Na (I = 3=2) e 133Cs (I = 7=2).
Title in English
Schrödingers cat state generation and study of nuclear relaxation in quadrupole spins via NMR.
Keywords in English
Lyotropic liquid crystal
Nuclear Magnetic Relaxation
Nuclear Magnetic Resonance
Redfield Theory
Schrödinger's cat
Abstract in English
This thesis was elaborated within the scope of Quantum Information, involving both theoretical aspects and experimental techniques associated with Nuclear Magnetic Resonance. In this sense, theoretical studies were conducted to describe the formalism of the generation of Schrödingers cat states and to present the mathematical development of nuclear relaxation via Redfields theory. On the other hand, the experimental aspects were implemented in a spin I = 3=2 system for the generation of Schrödingers cat states. Density matrices with fidelities above 0:96 were obtained by using quantum state tomography. In this regard, Wigner quasi-probability distribution functions were generated to demonstrate the characteristic interference patterns of this type of quantum state. Also, a spin I = 7=2 system was used to study magnetic relaxation in a way that both analytical and numerical solutions for all elements of the density matrix were obtained. In addition, to apply the theoretical equations, two Nuclear Magnetic Relaxation experiments were conducted: spin-echo and inversion-recovery, which allowed determining the spectral densities that characterize the molecular dynamics of the studied system. For both NMR experimental developments, samples of lyotropic liquid crystals containing 23Na (I = 3=2) and 133Cs (I = 7=2) nuclei were prepared.
 
WARNING - Viewing this document is conditioned on your acceptance of the following terms of use:
This document is only for private use for research and teaching activities. Reproduction for commercial use is forbidden. This rights cover the whole data about this document as well as its contents. Any uses or copies of this document in whole or in part must include the author's name.
Publishing Date
2022-09-12
 
WARNING: Learn what derived works are clicking here.
All rights of the thesis/dissertation are from the authors
CeTI-SC/STI
Digital Library of Theses and Dissertations of USP. Copyright © 2001-2024. All rights reserved.