Separability conditions and limit temperatures for entanglement detection in two-qubit Heisenberg XYZ models

We examine the entanglement of general mixed states of a two-qubit Heisenberg XYZ chain in the presence of a magnetic field, and its detection by means of different criteria. Both the exact separability conditions and the weaker conditions implied by the disorder and the von Neumann entropic criteri...

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Autores principales:	Canosa, Norma Beatriz, Rossignoli, Raúl Dante
Formato:	Articulo
Lenguaje:	Inglés
Publicado:	2004
Materias:	Ciencias Exactas Física entanglement magnetic field symmetry-breaking solution two-qubit Heisenberg
Acceso en línea:	http://sedici.unlp.edu.ar/handle/10915/125869 https://journals.aps.org/pra/abstract/10.1103/PhysRevA.69.052306
Aporte de:	SEDICI (UNLP) de Universidad Nacional de La Plata

id	I19-R120-10915-125869
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 entanglement magnetic field symmetry-breaking solution two-qubit Heisenberg
spellingShingle	Ciencias Exactas Física entanglement magnetic field symmetry-breaking solution two-qubit Heisenberg Canosa, Norma Beatriz Rossignoli, Raúl Dante Separability conditions and limit temperatures for entanglement detection in two-qubit Heisenberg XYZ models
topic_facet	Ciencias Exactas Física entanglement magnetic field symmetry-breaking solution two-qubit Heisenberg
description	We examine the entanglement of general mixed states of a two-qubit Heisenberg XYZ chain in the presence of a magnetic field, and its detection by means of different criteria. Both the exact separability conditions and the weaker conditions implied by the disorder and the von Neumann entropic criteria are analyzed. The ensuing limit temperatures for entanglement in thermal states of different XYZ models are then examined and compared with the limit temperature of the symmetry-breaking solution in a mean-field-type approximation. The latter, though generally lower, can also be higher than the exact limit temperature for entanglement in certain cases, indicating that symmetry breaking does not necessarily entail entanglement. The reentry of entanglement for increasing temperatures is also discussed.
format	Articulo Articulo
author	Canosa, Norma Beatriz Rossignoli, Raúl Dante
author_facet	Canosa, Norma Beatriz Rossignoli, Raúl Dante
author_sort	Canosa, Norma Beatriz
title	Separability conditions and limit temperatures for entanglement detection in two-qubit Heisenberg XYZ models
title_short	Separability conditions and limit temperatures for entanglement detection in two-qubit Heisenberg XYZ models
title_full	Separability conditions and limit temperatures for entanglement detection in two-qubit Heisenberg XYZ models
title_fullStr	Separability conditions and limit temperatures for entanglement detection in two-qubit Heisenberg XYZ models
title_full_unstemmed	Separability conditions and limit temperatures for entanglement detection in two-qubit Heisenberg XYZ models
title_sort	separability conditions and limit temperatures for entanglement detection in two-qubit heisenberg xyz models
publishDate	2004
url	http://sedici.unlp.edu.ar/handle/10915/125869 https://journals.aps.org/pra/abstract/10.1103/PhysRevA.69.052306
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bdutipo_str	Repositorios
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Separability conditions and limit temperatures for entanglement detection in two-qubit Heisenberg XYZ models

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