Correlations and Werner states in finite spin linear arrays

Pairwise quantum correlations in the ground state of an N-spins antiferromagnetic Heisenberg chain are investigated. By varying the exchange coupling between two neighboring sites, it is possible to reversibly drive spins from entangled to disentangled states. For even N, the two-spin density matrix...

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Bibliographic Details
Published in:Applied physics letters 2013-10, Vol.103 (17)
Main Authors: Wells, P. R., Chaves, C. M., d'Albuquerque e Castro, J., Koiller, Belita
Format: Article
Language:English
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Summary:Pairwise quantum correlations in the ground state of an N-spins antiferromagnetic Heisenberg chain are investigated. By varying the exchange coupling between two neighboring sites, it is possible to reversibly drive spins from entangled to disentangled states. For even N, the two-spin density matrix is written in the form of a Werner state, allowing identification of its single parameter with the usual spin-spin correlation function. The N = 4 chain is identified as a promising system for practical demonstrations of non-classical correlations and the realization of Werner states in familiar condensed matter systems. Fabrication and measurement ingredients are within current capabilities.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4825152