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Metric-Space Approach for Distinguishing Quantum Phase Transitions in Spin-Imbalanced Systems
(Springer, 2018-10-01)
Metric spaces are characterized by distances between pairs of elements. Systems that are physically similar are expected to present smaller distances (between their densities, wave functions, and potentials) than systems ...
Quantum dynamics under coherent and incoherent effects of a spin bath in the Keldysh formalism: Application to a spin swapping operation
(Elsevier Science, 2005-12)
We develop the Keldysh formalism for the polarization dynamics of an open spin system. We apply it to the swapping between two qubit states in a model describing an NMR cross-polarization experiment. The environment is a ...
Planar quantum squeezing in spin-1/2 systems
(IOP Publishing, 2015-10)
Planar quantum squeezed (PQS) states, i.e. quantum states which are squeezed in two orthogonal spin components on a plane, have recently attracted attention due to their applications in atomic interferometry and quantum ...
Role of initial conditions in the dynamics of quantum glassy systems
(IOP Publishing, 2019-02-25)
We set the formalism to study the way in which the choice of canonical equilibrium initial conditions affect the real-time dynamics of quantum disordered models. We use a path integral formulation on a time contour with ...
Termalização e correlações quânticas nos contextos de sistemas quânticos abertos e cadeias de spins
(Universidade Federal de São CarlosBRUFSCarPrograma de Pós-Graduação em Física - PPGF, 2013-01-11)
In this thesis, we study the behavior of Quantum Discord in the contexts of open quantum systems and spin chains. Furthermore, we investigate the thermalization process of a spin chain due to interaction with the environment. ...
Effects on the quantum not and controlled-not gates of a modular magnetic field in the z-direction in a chain of nuclear spin system
(Sociedad Mexicana de Física A.C., 2011)