Entanglement sudden death induced by the Dzialoshinskii--Moriya interaction |
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Authors: | Zeng Hong-Fang Shao Bin Yang Lin-Guang Li Jian and Zou Jian |
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Institution: | Department of Physics, School of Sciences, Beijing Institute of Technology, Beijing 100081, China |
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Abstract: | In this paper, we study the entanglement dynamics of two-spin
Heisenberg XYZ model with the Dzialoshinskii--Moriya (DM)
interaction. The system is initially prepared in the Werner state.
The effects of purity of the initial state and DM coupling parameter
on the evolution of entanglement are investigated. The necessary and
sufficient condition for the appearance of the entanglement sudden
death (ESD) phenomenon has been deduced. The result shows that the
ESD always occurs if the initial state is sufficiently impure for
the given coupling parameter or the DM interaction is sufficiently
strong for the given initial state. Moreover, the critical values of
them are calculated. |
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Keywords: | entanglement sudden death concurrence purity Dzialoshinskii-Moriya interaction |
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