Artículo
Entanglement and coherence in a spin-s XXZ system under non-uniform fields
Fecha de publicación:
04/2017
Editorial:
IOP Publishing
Revista:
Journal of Physics B: Atomic, Molecular and Optical Physics
ISSN:
0953-4075
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
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 can 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 between |h1 - h2| the fields applied at each spin, leading T > 0 for 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 non-uniform fields in the ferromagnetic case is also discussed.
Palabras clave:
Non-Uniform Fields
,
Quantum Coherence
,
Quantum Entanglement
,
Spin Systems
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Articulos(IFLP)
Articulos de INST.DE FISICA LA PLATA
Articulos de INST.DE FISICA LA PLATA
Citación
Ríos, E.; Rossignoli, Raúl Dante; Canosa, Norma Beatriz; Entanglement and coherence in a spin-s XXZ system under non-uniform fields; IOP Publishing; Journal of Physics B: Atomic, Molecular and Optical Physics; 50; 9; 4-2017; 1-12
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