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Type: Artigo de periódico
Title: Thermal entanglement in the two-qubit Heisenberg XYZ model
Author: Rigolin, G
Abstract: We study the entanglement of a two-qubit one-dimensional XYZ Heisenberg chain in thermal equilibrium at temperature T. We obtain an analytical expression for the concurrence of this system in terms of the parameters of the Hamiltonian and T. We show that depending on the relation among the coupling constants, it is possible to increase the amount of entanglement of the system by increasing its anisotropy. We also show numerically that for all sets of the coupling constants entanglement is a monotonically decreasing function of the temperature T, proving that we must have at least an external magnetic field in the z-direction to obtain a behavior where entanglement increases with T.
Subject: thermal entanglement
spin chains
Country: Singapura
Editor: World Scientific Publ Co Pte Ltd
Rights: fechado
Identifier DOI: 10.1142/S0219749904000262
Date Issue: 2004
Appears in Collections:Unicamp - Artigos e Outros Documentos

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