Entanglement and coherence in a spin-s XXZ system under non-uniform fields

We investigate entanglement and coherence in an XXZ spin-s pair immersed in a non-uniform transverse magnetic field. The ground state and thermal entanglement phase diagrams are analyzed in detail in both the ferromagnetic and antiferromagnetic cases. It is shown that a non-uniform field enables to...

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Autores principales: Ríos. E., Rossignoli, Raúl Dante, Canosa, Norma Beatriz
Formato: Articulo
Lenguaje:Inglés
Publicado: 2017
Materias:
Física
quantum entanglement
quantum coherence
quantum spin systems
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/80689
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-80689
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Física
quantum entanglement
quantum coherence
quantum spin systems
spellingShingle Física
quantum entanglement
quantum coherence
quantum spin systems
Ríos. E.
Rossignoli, Raúl Dante
Canosa, Norma Beatriz
Entanglement and coherence in a spin-s XXZ system under non-uniform fields
topic_facet Física
quantum entanglement
quantum coherence
quantum spin systems
description We investigate entanglement and coherence in an XXZ spin-s pair immersed in a non-uniform transverse magnetic field. The ground state and thermal entanglement phase diagrams are analyzed in detail in both the ferromagnetic and antiferromagnetic cases. It is shown that a non-uniform field enables to control the energy levels and the entanglement of the corresponding eigenstates, making it possible to entangle the system for any value of the exchange couplings, both at zero and finite temperatures. Moreover, the limit temperature for entanglement is shown to depend only on the difference |h1 − h2| between the fields applied at each spin, leading for T > 0 to a separability stripe in the (h1, h2) field plane such that the system becomes entangled above a threshold value of |h1 − h2|. These results are demonstrated to be rigorously valid for any spin s. On the other hand, the relative entropy of coherence in the standard basis, which coincides with the ground state entanglement entropy at T = 0 for any s, becomes non-zero for any value of the fields at T > 0, decreasing uniformly for sufficiently high T . A special critical point arising at T = 0 for nonuniform fields in the ferromagnetic case is also discussed.
format Articulo
Articulo
author Ríos. E.
Rossignoli, Raúl Dante
Canosa, Norma Beatriz
author_facet Ríos. E.
Rossignoli, Raúl Dante
Canosa, Norma Beatriz
author_sort Ríos. E.
title Entanglement and coherence in a spin-s XXZ system under non-uniform fields
title_short Entanglement and coherence in a spin-s XXZ system under non-uniform fields
title_full Entanglement and coherence in a spin-s XXZ system under non-uniform fields
title_fullStr Entanglement and coherence in a spin-s XXZ system under non-uniform fields
title_full_unstemmed Entanglement and coherence in a spin-s XXZ system under non-uniform fields
title_sort entanglement and coherence in a spin-s xxz system under non-uniform fields
publishDate 2017
url http://sedici.unlp.edu.ar/handle/10915/80689
work_keys_str_mv AT riose entanglementandcoherenceinaspinsxxzsystemundernonuniformfields
AT rossignolirauldante entanglementandcoherenceinaspinsxxzsystemundernonuniformfields
AT canosanormabeatriz entanglementandcoherenceinaspinsxxzsystemundernonuniformfields
bdutipo_str Repositorios
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