Decoherence from a spin chain with Dzyaloshinskii–Moriya interaction

doi:10.1088/1674-1056/21/10/100304

中国物理B ›› 2012, Vol. 21 ›› Issue (10): 100304-100304.doi: 10.1088/1674-1056/21/10/100304

Decoherence from a spin chain with Dzyaloshinskii–Moriya interaction

颜益营, 秦立国, 田立君

Department of Physics, Shanghai University, Shanghai 200444, China

收稿日期:2012-02-21 修回日期:2012-04-06 出版日期:2012-09-01 发布日期:2012-09-01
基金资助:
Project supported by the National Natural Science Foundation of China (Grant No. 11075101).

Decoherence from a spin chain with Dzyaloshinskii–Moriya interaction

Yan Yi-Ying (颜益营), Qin Li-Guo (秦立国), Tian Li-Jun (田立君)

Department of Physics, Shanghai University, Shanghai 200444, China

Received:2012-02-21 Revised:2012-04-06 Online:2012-09-01 Published:2012-09-01
Contact: Tian Li-Jun E-mail:tianlijun@staff.shu.edu.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant No. 11075101).

摘要/Abstract

摘要： We study the dynamics of quantum discord and entanglement for two spin qubits coupled to a spin chain with Dzyaloshinsky-Moriya interaction. In the case of a two-qubit with an initial pure state, quantum correlations decay to zero at the critical point of the environment in a very short time. In the case of a two-qubit with initial mixed state, it is found that quantum discord may get maximized due to the quantum critical behavior of the environment, while entanglement vanishes under the same condition. Besides, we observed a sudden transition between classical and quantum decoherence when only a single qubit interacts with the environment. The effects of Dzyaloshinsky-Moriya interaction on quantum correlations are considered in the two cases. The decay of quantum correlations is always strengthened by Dzyaloshinsky-Moriya interaction.

关键词: quantum discord, entanglement, decoherence

Abstract: We study the dynamics of quantum discord and entanglement for two spin qubits coupled to a spin chain with Dzyaloshinsky-Moriya interaction. In the case of a two-qubit with an initial pure state, quantum correlations decay to zero at the critical point of the environment in a very short time. In the case of a two-qubit with initial mixed state, it is found that quantum discord may get maximized due to the quantum critical behavior of the environment, while entanglement vanishes under the same condition. Besides, we observed a sudden transition between classical and quantum decoherence when only a single qubit interacts with the environment. The effects of Dzyaloshinsky-Moriya interaction on quantum correlations are considered in the two cases. The decay of quantum correlations is always strengthened by Dzyaloshinsky-Moriya interaction.

Key words: quantum discord, entanglement, decoherence

中图分类号: (Foundations of quantum mechanics; measurement theory)

03.65.Ta

03.65.Yz (Decoherence; open systems; quantum statistical methods) 03.67.Mn (Entanglement measures, witnesses, and other characterizations)

颜益营, 秦立国, 田立君. Decoherence from a spin chain with Dzyaloshinskii–Moriya interaction[J]. 中国物理B, 2012, 21(10): 100304-100304.

Yan Yi-Ying (颜益营), Qin Li-Guo (秦立国), Tian Li-Jun (田立君). Decoherence from a spin chain with Dzyaloshinskii–Moriya interaction[J]. Chin. Phys. B, 2012, 21(10): 100304-100304.

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Decoherence from a spin chain with Dzyaloshinskii–Moriya interaction

Decoherence from a spin chain with Dzyaloshinskii–Moriya interaction

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