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Doctoral Thesis
DOI
https://doi.org/10.11606/T.76.2024.tde-22052024-081745
Document
Author
Full name
Gabriel Fukamoto Magno
Institute/School/College
Knowledge Area
Date of Defense
Published
São Carlos, 2024
Supervisor
Committee
Pinto, Diogo de Oliveira Soares (President)
Celeri, Lucas Chibebe
Duzzioni, Eduardo Inácio
Pires, Diego Paiva
Sarandy, Marcelo Silva
Title in Portuguese
Quantificador de adiabaticidade em sistemas quânticos via geometrias clássicas
Keywords in Portuguese
Evolução adiabática
Geometria da informação
Geometrias clássicas
Isometria acompanhante
Abstract in Portuguese
Partindo da abordagem matemática de geometrias clássicas, uma abordagem linear para modelos geométricos que aparecem com frequência em Física (e.g. Fubini-Study, hiperbólico, de Sitter, anti-de Sitter, conforme), elaboraremos um novo quantificador para adiabaticidade no contexto de sistemas quânticos puros com dinâmica unitária. O quantificador será construído a partir da isometria acompanhante, conceito naturalmente definido neste cenário que tem a si atrelado uma estrutura de fibrado principal. Este quantificador, vindo da geometria ambiente do problema, deve carregar consigo a história da evolução e servirá como base para formulação de um bom critério geométrico para adiabaticidade. Para fins de exemplificação, traremos duas aplicações no caso de q-bits com Hamiltonianos paradigmáticos apresentando gaps de energia variável e constante ao longo do tempo de evolução.
Title in English
Adiabaticity quantifier in quantum systems throught classical geometries
Keywords in English
Adiabatic evolution
Classical geometries
Information geometry
Path-following isometry
Abstract in English
From the mathematical approach of classical geometries, a linear approach to geometric models that appear frequently in Physics (e.g. Fubini-Study, hyperbolic, de Sitter, anti-de Sitter, conformal), we want to present a new quantifier for adiabaticity in the context of pure quantum systems with unitary dynamics. The quantifier will be constructed from the path-following isometry, naturally defined object in this scenario that has a principal bundle structure associated to it. This quantifier, coming from the ambient geometry of the problem, must carry with it the history of evolution and will serve as a basis for formulating a good geometric criteria for adiabaticity. For exemplification purposes, we will bring two applications in the q-bits case with a paradigmatic Hamiltonians presenting energy gaps that are variable and constant over the time of evolution.
 
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Publishing Date
2024-05-22
 
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