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The European Physical Journal D

, Volume 50, Issue 1, pp 103–105 | Cite as

Entanglement, fidelity, and quantum phase transition in antiferromagnetic-ferromagnetic alternating Heisenberg chain

  • J. RenEmail author
  • S. Zhu
Quantum Optics and Quantum Information

Abstract

The fidelity and entanglement entropy in an antiferromagnetic-ferromagnetic alternating Heisenberg chain are investigated by using the method of density-matrix renormalization-group. The effects of anisotropy on fidelity and entanglement entropy are investigated. The relations between fidelity, entanglement entropy and quantum phase transition are analyzed. It is found that the quantum phase transition point can be well characterized by both the ground-state entropy and fidelity for large system.

PACS

03.67.-a Quantum information 03.65.Ud Entanglement and quantum nonlocality 75.10.Pq Spin chain models 

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Copyright information

© Springer 2008

Authors and Affiliations

  1. 1.School of Physical Science and Technology, Suzhou UniversityJiangsuP.R. China

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