Physical Review A, ( ISI ), Volume (77), No (4), Year (2008-4) , Pages (42309-42309)

Title : ( Effect of spin-orbit interaction on entanglement of two-qubit Heisenberg XYZ systems in an inhomogeneous magnetic field )

Authors: Fardin Kheirandish , Seyed Javad Akhtarshenas , Hamidreza Mohammadi ,

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The role of spin-orbit interaction in the ground state and thermal entanglement of a Heisenberg XYZ two-qubit system in the presence of an inhomogeneous magnetic field is investigated. We show that the ground state entanglement tends to vanish suddenly for a certain value of the spin-orbit parameter D and, when D crosses its critical value D c , the entanglement undergoes a revival. Indeed, when D crosses its critical value (D c ) , the ground state entanglement tends to its maximum value (C=1) . Also, at finite temperatures there are revival regions in the D−T plane. In these regions, entanglement first increases with increasing temperature and then decreases and ultimately vanishes for temperatures above a critical value. We find that this critical temperature is an increasing function of D and that the amount of entanglement in the revival region depends on the spin-orbit parameter. Therefore when spin-orbit interaction is included larger thermal entanglement can exist at higher temperatures. We also show that the rate of enhancement of thermal entanglement by D is not the same for ferromagnetic (J z <0) and antiferromagnatic (J z >0) chains. The entanglement teleportation via the quantum channel constructed by the above system is also investigated, and the influence of the spin-orbit interaction on the fidelity of teleportation and entanglement of replica states is studied. We show that, by introducing spin-orbit interaction, the entanglement of the replica state and fidelity of teleportation can be increased for the case of J z <0 . We also argue that a minimal entanglement of the channel is required to realize efficient entanglement teleportation and, in the case of J z <0 , this minimal entanglement can be achieved by introducing spin-orbit interaction.

Keywords

, Spin-orbit interaction, Entanglement, Heisenberg
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@article{paperid:1046897,
author = {Fardin Kheirandish and Akhtarshenas, Seyed Javad and Hamidreza Mohammadi},
title = {Effect of spin-orbit interaction on entanglement of two-qubit Heisenberg XYZ systems in an inhomogeneous magnetic field},
journal = {Physical Review A},
year = {2008},
volume = {77},
number = {4},
month = {April},
issn = {2469-9926},
pages = {42309--42309},
numpages = {0},
keywords = {Spin-orbit interaction; Entanglement; Heisenberg model},
}

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%0 Journal Article
%T Effect of spin-orbit interaction on entanglement of two-qubit Heisenberg XYZ systems in an inhomogeneous magnetic field
%A Fardin Kheirandish
%A Akhtarshenas, Seyed Javad
%A Hamidreza Mohammadi
%J Physical Review A
%@ 2469-9926
%D 2008

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