中国物理B ›› 2009, Vol. 18 ›› Issue (8): 3210-3214.doi: 10.1088/1674-1056/18/8/019

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Entanglement dynamics of a Heisenberg chain with Dzyaloshinskii--Moriya interaction

张小平1, 任中洲1, 郑强2, 支启军3   

  1. (1)Department of Physics, Nanjing University, Nanjing 210093, China; (2)Department of Physics, Nanjing University, Nanjing 210093, China;School of Mathematics and Computer-Science, Guizhou Normal University, Guiyang 550001, China; (3)School of Physics and Electronics, Guizhou Normal University, Guiyang 550001, China
  • 收稿日期:2008-10-20 修回日期:2008-11-17 出版日期:2009-08-20 发布日期:2009-08-20
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos 10535010, 10775123 and 10865004), Research Fund of the Education Ministry of China (Grant No 20070284016).

Entanglement dynamics of a Heisenberg chain with Dzyaloshinskii--Moriya interaction

Zheng Qiang(郑强)a)c)†, Zhang Xiao-Ping(张小平)a), Zhi Qi-Jun(支启军)b), and Ren Zhong-Zhou(任中洲)a)   

  1. a Department of Physics, Nanjing University, Nanjing 210093, China; b School of Mathematics and Computer-Science, Guizhou Normal University, Guiyang 550001, China; c School of Physics and Electronics, Guizhou Normal University, Guiyang 550001, China
  • Received:2008-10-20 Revised:2008-11-17 Online:2009-08-20 Published:2009-08-20
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos 10535010, 10775123 and 10865004), Research Fund of the Education Ministry of China (Grant No 20070284016).

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摘要： This paper investigates the entanglement dynamics of the system, composed of two qubits A and B with Heisenberg XX spin interactation. There is a third controller qubit C, which only has Dzyaloshinskii--Moriya (DM) spin-orbit interaction with the qubit B. It is found that depending on the initial state of the controller qubit C and DM interaction, the entanglement of the system displays amplification and sudden birth effects. These effects indicate that one can control the entanglement of the system, which may be helpful for quantum information processing.

Abstract: This paper investigates the entanglement dynamics of the system, composed of two qubits A and B with Heisenberg XX spin interactation. There is a third controller qubit C, which only has Dzyaloshinskii--Moriya (DM) spin-orbit interaction with the qubit B. It is found that depending on the initial state of the controller qubit C and DM interaction, the entanglement of the system displays amplification and sudden birth effects. These effects indicate that one can control the entanglement of the system, which may be helpful for quantum information processing.

Key words: entanglement sudden birth, entanglement amplification, DM interaction

中图分类号:  (Entanglement and quantum nonlocality)

  • 03.65.Ud
03.67.Lx (Quantum computation architectures and implementations) 03.67.Mn (Entanglement measures, witnesses, and other characterizations) 75.10.Jm (Quantized spin models, including quantum spin frustration)