Global thermal entanglement in n-qubit systems

We examine the entanglement of thermal states of n spins interacting through different types of XY couplings in the presence of a uniform magnetic field, by evaluating the negativities of all possible bipartite partitions of the whole system and of subsystems. We consider both the case where every q...

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Detalles Bibliográficos
Autores principales: Rossignoli, Raúl Dante, Canosa, Norma Beatriz
Formato: Articulo
Lenguaje:Inglés
Publicado: 2005
Materias:
Ciencias Exactas
Física
Physics
Thermal entanglement
Uniform magnetic field
Limit temperatures
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/125845
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-125845
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Exactas
Física
Physics
Thermal entanglement
Uniform magnetic field
Limit temperatures
spellingShingle Ciencias Exactas
Física
Physics
Thermal entanglement
Uniform magnetic field
Limit temperatures
Rossignoli, Raúl Dante
Canosa, Norma Beatriz
Global thermal entanglement in n-qubit systems
topic_facet Ciencias Exactas
Física
Physics
Thermal entanglement
Uniform magnetic field
Limit temperatures
description We examine the entanglement of thermal states of n spins interacting through different types of XY couplings in the presence of a uniform magnetic field, by evaluating the negativities of all possible bipartite partitions of the whole system and of subsystems. We consider both the case where every qubit interacts with all others and where just nearest neighbors interact in a one-dimensional chain. Limit temperatures for nonzero negativities are also evaluated and compared with the mean field critical temperature. It is shown that limit temperatures of global negativities are strictly independent of the magnetic field in all XXZ models, in spite of the quantum transitions that these models may exhibit at zero temperature, while in anisotropic models they always increase for sufficiently large fields. Results also show that these temperatures are higher than those limiting pairwise entanglement.
format Articulo
Articulo
author Rossignoli, Raúl Dante
Canosa, Norma Beatriz
author_facet Rossignoli, Raúl Dante
Canosa, Norma Beatriz
author_sort Rossignoli, Raúl Dante
title Global thermal entanglement in n-qubit systems
title_short Global thermal entanglement in n-qubit systems
title_full Global thermal entanglement in n-qubit systems
title_fullStr Global thermal entanglement in n-qubit systems
title_full_unstemmed Global thermal entanglement in n-qubit systems
title_sort global thermal entanglement in n-qubit systems
publishDate 2005
url http://sedici.unlp.edu.ar/handle/10915/125845
work_keys_str_mv AT rossignolirauldante globalthermalentanglementinnqubitsystems
AT canosanormabeatriz globalthermalentanglementinnqubitsystems
bdutipo_str Repositorios
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