Global entanglement in XXZ chains

Journal Article · Wed Feb 15 00:00:00 EST 2006 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.73.022347· OSTI ID:20974563

Canosa, N; Rossignoli, R ^[1]

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1. Departamento de Fisica, Universidad Nacional de La Plata, Casilla de Correo 67, La Plata (1900) (Argentina)

We examine the thermal entanglement of XXZ-type Heisenberg chains in the presence of a uniform magnetic field along the z axes through the evaluation of the negativity associated with bipartitions of the whole system and subsystems. Limit temperatures for nonzero global negativities are shown to depend on the asymmetry {delta}, but not on the uniform field, and can be much higher than those limiting pairwise entanglement. It is also shown that global bipartite entanglement may exist for T>0 even for {delta}{>=}1, i.e., when the system is fully aligned (and hence separable) at T=0, and that the bipartition leading to the highest limit temperature depends on {delta}.

• OSTI ID: 20974563
• Journal Information: Physical Review. A, Vol. 73, Issue 2; Other Information: DOI: 10.1103/PhysRevA.73.022347; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1050-2947
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ASYMMETRY
CHAINS
EVALUATION
HEISENBERG MODEL
MAGNETIC FIELDS
QUANTUM ENTANGLEMENT
QUANTUM MECHANICS