| Entanglement of a two-qubit anisotropic Heisenberg XYZ chain in nonuniform magnetic fields with intrinsic decoherence |
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| 引用本文： | 徐晓波,刘金明,于鹏飞. Entanglement of a two-qubit anisotropic Heisenberg XYZ chain in nonuniform magnetic fields with intrinsic decoherence[J]. 中国物理 B, 2008, 17(2): 456-461 |
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| 作者姓名： | 徐晓波 刘金明 于鹏飞 |
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| 作者单位： | Key Laboratory of Optical and Magnetic ResonanceSpectroscopy, Department of Physics, East China Normal University, Shanghai 200062, China;Key Laboratory of Optical and Magnetic ResonanceSpectroscopy, Department of Physics, East China Normal University, Shanghai 200062, China;Key Laboratory of Optical and Magnetic ResonanceSpectroscopy, Department of Physics, East China Normal University, Shanghai 200062, China |
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| 基金项目： | Project supportedby the State Key Development Program for Basic Research of China(Grant No 2006CB921604) and the National NaturalScience Foundation of China (Grant Nos 60708003, 60578050 and 10434060). |
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| 摘 要： | Taking the intrinsic decoherence effect into account, this paper investigates the entanglement of a two-qubit anisotropic Heisenberg XYZ model in the presence of nonuniform external magnetic fields by employing the concurrence as entanglement measure. It is found that both the intrinsic decoherence and the anisotropy of the system give a significant suppression to the entanglement. Moreover it finds that the initial state of the system plays an important role in the time evolution of the entanglement, which means that the entanglement of the system is independent of the nonuniformity and uniformity of the magnetic field when the system is in the initial state ｜ψ （0）） = ｜00） and [ψ′ （0）） = m ｜01） ＋ n ｜10）, respectively.
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| 关 键 词： | 磁场学 脱离状态 海森堡 非均质 |
| 收稿时间： | 2007-06-12 |
| 修稿时间： | 2007-07-06 |
Entanglement of a two-qubit anisotropic Heisenberg XYZ chain in nonuniform magnetic fields with intrinsic decoherence |
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| Xu Xiao-Bo,Liu Jin-Ming and Yu Peng-Fei. Entanglement of a two-qubit anisotropic Heisenberg XYZ chain in nonuniform magnetic fields with intrinsic decoherence[J]. Chinese Physics B, 2008, 17(2): 456-461 |
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| Authors: | Xu Xiao-Bo Liu Jin-Ming Yu Peng-Fei |
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| Affiliation: | Key Laboratory of Optical and Magnetic ResonanceSpectroscopy, Department of Physics, East China Normal University, Shanghai 200062, China |
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| Abstract: | Taking the intrinsic decoherence effect into account, this paperinvestigates the entanglement of a two-qubit anisotropic HeisenbergXYZ model in the presence of nonuniform external magnetic fieldsby employing the concurrence as entanglement measure. It is foundthat both the intrinsic decoherence and the anisotropy of the systemgive a significant suppression to the entanglement. Moreover itfinds that the initial state of the system plays an important rolein the time evolution of the entanglement, which means that theentanglement of the system is independent of the nonuniformity anduniformity of the magnetic field when the system is in the initialstate left| Ps left( 0right) rightrangle =left|00rightrangle and left| Ps’left( 0right)rightrangle =mleft| 01rightrangle +nleft| 10rightrangle ,respectively. |
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| Keywords: | Heisenberg XYZ chain concurrence magnetic field intrinsic decoherence |
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