publication . Article . Preprint . 2008


Shiqun Zhu; Xiang Hao;
Open Access
  • Published: 05 Mar 2008 Journal: International Journal of Quantum Information, volume 4, pages 1,037-1,047 (issn: 0219-7499, eissn: 1793-6918, Copyright policy)
  • Publisher: World Scientific Pub Co Pte Lt
<jats:p> The entanglement properties in an antiferromagnetic dimerized Heisenberg spin-1/2 chain are investigated. The entanglement gap, which is the difference between the ground-state energy and the minimal energy that any separable state can attain, is calculated to detect the entanglement. It is found that the entanglement gap can be increased by varying the alternation parameter. Through thermal energy, the witness of the entanglement can determine a characteristic temperature below which an entangled state can be obtained. The entanglement detected by the energy can provide a lower bound for that determined by the concurrence. If the alternation parameter ...
Persistent Identifiers
arXiv: Computer Science::Databases
free text keywords: Physics and Astronomy (miscellaneous), Quantum Physics, Upper and lower bounds, Concurrence, Squashed entanglement, Quantum mechanics, Multipartite entanglement, Condensed matter physics, Entanglement witness, Quantum entanglement, W state, Physics, Separable state
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