Quantum discord in finite XY chains

We examine the quantum discord between two spins in the exact ground state of finite spin-1/2 arrays with anisotropic XY couplings in a transverse field B. It is shown that in the vicinity of the factorizing field Bs, the discord approaches a common finite non-negligible limit which is independent o...

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Detalles Bibliográficos
Autores principales: Ciliberti, Leonardo Francisco, Rossignoli, Raúl Dante, Canosa, Norma Beatriz
Formato: Articulo
Lenguaje:Inglés
Publicado: 2010
Materias:
Física
Coupling
Physics
Quantum discord
Quantum state
Parity (physics)
Spins
Quantum mechanics
Ground state
Anisotropy
Coherence (physics)
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/126472
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-126472
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Física
Coupling
Physics
Quantum discord
Quantum state
Parity (physics)
Spins
Quantum mechanics
Ground state
Anisotropy
Coherence (physics)
spellingShingle Física
Coupling
Physics
Quantum discord
Quantum state
Parity (physics)
Spins
Quantum mechanics
Ground state
Anisotropy
Coherence (physics)
Ciliberti, Leonardo Francisco
Rossignoli, Raúl Dante
Canosa, Norma Beatriz
Quantum discord in finite XY chains
topic_facet Física
Coupling
Physics
Quantum discord
Quantum state
Parity (physics)
Spins
Quantum mechanics
Ground state
Anisotropy
Coherence (physics)
description We examine the quantum discord between two spins in the exact ground state of finite spin-1/2 arrays with anisotropic XY couplings in a transverse field B. It is shown that in the vicinity of the factorizing field Bs, the discord approaches a common finite non-negligible limit which is independent of the pair separation and the coupling range. An analytic expression of this limit is provided. The discord of a mixture of aligned pairs in two different directions, crucial for the previous results, is analyzed in detail, including the evaluation of coherence effects, relevant in small samples and responsible for a parity splitting at Bs. Exact results for finite chains with first-neighbor and full-range couplings and their interpretation in terms of such mixtures are provided.
format Articulo
Articulo
author Ciliberti, Leonardo Francisco
Rossignoli, Raúl Dante
Canosa, Norma Beatriz
author_facet Ciliberti, Leonardo Francisco
Rossignoli, Raúl Dante
Canosa, Norma Beatriz
author_sort Ciliberti, Leonardo Francisco
title Quantum discord in finite XY chains
title_short Quantum discord in finite XY chains
title_full Quantum discord in finite XY chains
title_fullStr Quantum discord in finite XY chains
title_full_unstemmed Quantum discord in finite XY chains
title_sort quantum discord in finite xy chains
publishDate 2010
url http://sedici.unlp.edu.ar/handle/10915/126472
work_keys_str_mv AT cilibertileonardofrancisco quantumdiscordinfinitexychains
AT rossignolirauldante quantumdiscordinfinitexychains
AT canosanormabeatriz quantumdiscordinfinitexychains
bdutipo_str Repositorios
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