Thermal entanglement in fully connected spin systems and its random-phase-approximation description

We examine the thermal pairwise entanglement in a symmetric system of n spins fully connected through anisotropic XYZ-type couplings embedded in a transverse magnetic field. We consider both the exact evaluation together with that obtained with the static path+random phase approximation RPA and th...

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Autores principales: Matera, Juan Mauricio, Rossignoli, Raúl Dante, Canosa, Norma Beatriz
Formato: Articulo
Lenguaje:Inglés
Publicado: 2008
Materias:
Física
Entanglement measures
Entanglement and quantum nonlocality
Quantized spin models
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/154215
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-154215
record_format dspace
spelling I19-R120-10915-1542152023-06-12T20:07:03Z http://sedici.unlp.edu.ar/handle/10915/154215 issn:1050-2947 issn:1094-1622 Thermal entanglement in fully connected spin systems and its random-phase-approximation description Matera, Juan Mauricio Rossignoli, Raúl Dante Canosa, Norma Beatriz 2008 2023-06-12T14:51:36Z en Física Entanglement measures Entanglement and quantum nonlocality Quantized spin models We examine the thermal pairwise entanglement in a symmetric system of n spins fully connected through anisotropic XYZ-type couplings embedded in a transverse magnetic field. We consider both the exact evaluation together with that obtained with the static path+random phase approximation RPA and the ensuing mean field+RPA. The latter is shown to provide an accurate analytic description of both the parallel and antiparallel thermal concurrence in large systems. We also analyze the limit temperature for pairwise entanglement, which is shown to increase for large fields and to decrease logarithmically with increasing n. Special finite-size effects are also discussed. Quantum Information Research Group Instituto de Física La Plata Articulo Articulo http://creativecommons.org/licenses/by-nc-sa/4.0/ Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0) application/pdf
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Física
Entanglement measures
Entanglement and quantum nonlocality
Quantized spin models
spellingShingle Física
Entanglement measures
Entanglement and quantum nonlocality
Quantized spin models
Matera, Juan Mauricio
Rossignoli, Raúl Dante
Canosa, Norma Beatriz
Thermal entanglement in fully connected spin systems and its random-phase-approximation description
topic_facet Física
Entanglement measures
Entanglement and quantum nonlocality
Quantized spin models
description We examine the thermal pairwise entanglement in a symmetric system of n spins fully connected through anisotropic XYZ-type couplings embedded in a transverse magnetic field. We consider both the exact evaluation together with that obtained with the static path+random phase approximation RPA and the ensuing mean field+RPA. The latter is shown to provide an accurate analytic description of both the parallel and antiparallel thermal concurrence in large systems. We also analyze the limit temperature for pairwise entanglement, which is shown to increase for large fields and to decrease logarithmically with increasing n. Special finite-size effects are also discussed.
format Articulo
Articulo
author Matera, Juan Mauricio
Rossignoli, Raúl Dante
Canosa, Norma Beatriz
author_facet Matera, Juan Mauricio
Rossignoli, Raúl Dante
Canosa, Norma Beatriz
author_sort Matera, Juan Mauricio
title Thermal entanglement in fully connected spin systems and its random-phase-approximation description
title_short Thermal entanglement in fully connected spin systems and its random-phase-approximation description
title_full Thermal entanglement in fully connected spin systems and its random-phase-approximation description
title_fullStr Thermal entanglement in fully connected spin systems and its random-phase-approximation description
title_full_unstemmed Thermal entanglement in fully connected spin systems and its random-phase-approximation description
title_sort thermal entanglement in fully connected spin systems and its random-phase-approximation description
publishDate 2008
url http://sedici.unlp.edu.ar/handle/10915/154215
work_keys_str_mv AT materajuanmauricio thermalentanglementinfullyconnectedspinsystemsanditsrandomphaseapproximationdescription
AT rossignolirauldante thermalentanglementinfullyconnectedspinsystemsanditsrandomphaseapproximationdescription
AT canosanormabeatriz thermalentanglementinfullyconnectedspinsystemsanditsrandomphaseapproximationdescription
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