| Negativity in the Extended Hubbard Model under External Magnetic Field |
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| 作者姓名： | 杨桢 宁文强 |
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| 作者单位： | [1]Department of Physics, Fudan University, Shanghai 200433 [2]Department of Physics, Chinese University of Hong Kong, Hong Kong |
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| 基金项目： | Supported by the Research Grant Council （RGC） CUHK 400906. We thank S. J. GU for suggesting this problem to us. We are also grateful for the hospitality of the Department of Physics at the Chinese University of Hong Kong. |
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| 摘 要： | We exactly calculate the negativity, a measurement of entanglement, in the two-site extended Hubbard model with external magnetic field. Its behaviour at different temperatures is presented. The negativity reduces with the increasing temperature or with the increasing uniform external magnetic field. It is also found that a non-uniform external magnetic field can be used to modulate or to increase the negativity.
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| 关 键 词： | 扩展哈伯德模型 外部磁场 量子纠缠 量子计算 |
| 收稿时间： | 2007-07-27 |
Negativity in the Extended Hubbard Model under External Magnetic Field |
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| YANG Zhen,NING Wen-Qiang.Negativity in the Extended Hubbard Model under External Magnetic Field[J].Chinese Physics Letters,2008,25(1):31-34. |
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| Authors: | YANG Zhen NING Wen-Qiang |
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| Institution: | Department of Physics, Fudan University, Shanghai 200433Department of Physics, Chinese University of Hong Kong, Hong Kong |
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| Abstract: | We exactly calculate the negativity, a measurement of entanglement, in the two-site extended Hubbard model with external magnetic field. Its behaviour at different temperatures is presented. The negativity reduces with the increasing temperature or with the increasing uniform external magnetic field. It is also found that a non-uniform external magnetic field can be used to modulate or to increase the negativity. |
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| Keywords: | 03 67 Mn 03 65 Ud 71 10 Fd |
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