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)
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
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.
Received: 20 October 2008
Revised: 17 November 2008
Accepted manuscript online:
(Quantized spin models, including quantum spin frustration)
Fund: 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).
Cite this article:
Zheng Qiang(郑强), Zhang Xiao-Ping(张小平), Zhi Qi-Jun(支启军), and Ren Zhong-Zhou(任中洲) Entanglement dynamics of a Heisenberg chain with Dzyaloshinskii--Moriya interaction 2009 Chin. Phys. B 18 3210
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