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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Incerteza quântica local em transições de fase quânticas e uma generalização para sistemas multipartidos / Local quantum uncertainty in quantum phase transitions and a generalization for multipartite systems

Carrijo, Thiago Mureebe 02 May 2018 (has links)
Submitted by Luciana Ferreira (lucgeral@gmail.com) on 2018-06-11T12:56:20Z No. of bitstreams: 2 Tese - Thiago Mureebe Carrijo - 2018.pdf: 5034985 bytes, checksum: 627c2d90a4e7fa2b7ebc112a3b54e16f (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) / Approved for entry into archive by Luciana Ferreira (lucgeral@gmail.com) on 2018-06-11T15:48:17Z (GMT) No. of bitstreams: 2 Tese - Thiago Mureebe Carrijo - 2018.pdf: 5034985 bytes, checksum: 627c2d90a4e7fa2b7ebc112a3b54e16f (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) / Made available in DSpace on 2018-06-11T15:48:17Z (GMT). No. of bitstreams: 2 Tese - Thiago Mureebe Carrijo - 2018.pdf: 5034985 bytes, checksum: 627c2d90a4e7fa2b7ebc112a3b54e16f (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) Previous issue date: 2018-05-02 / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES / In this work, we have studied how local quantum uncertainty (LQU) and linear entropy behave in critical systems. Two models of spin 1/2 systems were investigated: XY and XY with triple interaction (XYT), both unidimensional. It was concluded that these measures and their derivatives locate the phase transitions of these systems and a justification was given for the difference of behavior between the LQU and the linear entropy in the region near the transition in the XY model. A measure of multipartite quantum correlations was also created according to a set of axiomatic criteria, which was tested in the family of Werner-GHZ quantum states, producing results in accordance with the expected result, according to the literature. / Neste trabalho, foi estudado como a incerteza quântica local (LQU) e a entropia linear se comportam em sistemas críticos. Foram investigados dois modelos de sistemas de spin 1/2: XY e XY com interação tripla (XYT): ambos unidimensionais. Concluiu-se que essas medidas e suas derivadas marcam as transições de fase desses sistemas e foi dada uma justificativa para a diferença de comportamento entre a LQU e a entropia linear na região próxima da transição no modelo XY. Também foi criada uma medida de correlações quânticas multipartidas segundo um conjunto de critérios axiomáticos, a qual foi testada na família de estados quânticos Werner-GHZ, produzindo resultados em conformidade com esperado segundo o que há na literatura.

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