Incerteza quântica local em transições de fase quânticas e uma generalização para sistemas multipartidos
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2018-05-02
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Universidade Federal de Goiás
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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.
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CARRIJO, T. M. Incerteza quântica local em transições de fase quânticas e uma generalização para sistemas multipartidos. 2018. 58 f. Tese (Doutorado em Fisica) - Universidade Federal de Goiás, Goiânia, 2018.