Dense coding with a two-qubit Heisenberg XYZ chain under the influence of phase decoherence

doi:10.1088/1674-1056/20/5/050305

中国物理B ›› 2011, Vol. 20 ›› Issue (5): 50305-050305.doi: 10.1088/1674-1056/20/5/050305

Dense coding with a two-qubit Heisenberg XYZ chain under the influence of phase decoherence

苏拉依曼·司马义, 艾合买提·阿不力孜, 木沙江·亚尔买买提, 蔡江涛, 乔盼盼

School of Physics and Electronic Engineering, Xinjiang Normal University, Wulumuqi 830054, China

收稿日期:2010-07-03 修回日期:2011-01-17 出版日期:2011-05-15 发布日期:2011-05-15
基金资助:
Project supported by the National Natural Science Foundation of China (Grant No. 10064004), the Priority Subjects Program for Theoretical Physics of Xinjiang Normal University (XJNU), China, and the Science and Technology Innovative Foundation for Graduat

Dense coding with a two-qubit Heisenberg XYZ chain under the influence of phase decoherence

Sulayiman Simayi(苏拉依曼·司马义), Aihemaiti Abulizi(艾合买提·阿不力孜)^†, Mushajiang Yaermaimaiti(木沙江·亚尔买买提), Cai Jiang-Tao(蔡江涛), and Qiao Pan-Pan(乔盼盼)

School of Physics and Electronic Engineering, Xinjiang Normal University, Wulumuqi 830054, China

Received:2010-07-03 Revised:2011-01-17 Online:2011-05-15 Published:2011-05-15
Supported by:
Project supported by the National Natural Science Foundation of China (Grant No. 10064004), the Priority Subjects Program for Theoretical Physics of Xinjiang Normal University (XJNU), China, and the Science and Technology Innovative Foundation for Graduate Students of XJNU, China (Grant No. 20101203).

摘要/Abstract

摘要： We investigate the joint effects of phase decoherence, Dzyaloshinskii–Moriya (DM) interaction and inhomogeneity of the external magnetic field (b) on dense coding in a two-qubit anisotropic Heisenberg XYZ spin chain. Analytical expressions are obtained for the dense coding capacity. It is found that valid dense coding is always possible with this model when the system is initially prepared in the maximum entangled state. Moreover, optimal dense coding can be implemented for this initial state as long as the mean spin–spin coupling constant J₊ of the XY plane is larger than b and the DM interaction despite the intrinsic decoherence. Non-maximal entangled initial states are found to be undesirable for dense coding with this model.

Abstract: We investigate the joint effects of phase decoherence, Dzyaloshinskii–Moriya (DM) interaction and inhomogeneity of the external magnetic field (b) on dense coding in a two-qubit anisotropic Heisenberg XYZ spin chain. Analytical expressions are obtained for the dense coding capacity. It is found that valid dense coding is always possible with this model when the system is initially prepared in the maximum entangled state. Moreover, optimal dense coding can be implemented for this initial state as long as the mean spin–spin coupling constant J₊ of the XY plane is larger than b and the DM interaction despite the intrinsic decoherence. Non-maximal entangled initial states are found to be undesirable for dense coding with this model.

Key words: dense coding, intrinsic decoherence, DM interaction

中图分类号: (Quantum information)

03.67.-a

03.65.Ud (Entanglement and quantum nonlocality) 75.10.Pq (Spin chain models)

苏拉依曼·司马义, 艾合买提·阿不力孜, 木沙江·亚尔买买提, 蔡江涛, 乔盼盼. Dense coding with a two-qubit Heisenberg XYZ chain under the influence of phase decoherence[J]. 中国物理B, 2011, 20(5): 50305-050305.

Sulayiman Simayi(苏拉依曼·司马义), Aihemaiti Abulizi(艾合买提·阿不力孜), Mushajiang Yaermaimaiti(木沙江·亚尔买买提), Cai Jiang-Tao(蔡江涛), and Qiao Pan-Pan(乔盼盼). Dense coding with a two-qubit Heisenberg XYZ chain under the influence of phase decoherence[J]. Chin. Phys. B, 2011, 20(5): 50305-050305.

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Dense coding with a two-qubit Heisenberg XYZ chain under the influence of phase decoherence

Dense coding with a two-qubit Heisenberg XYZ chain under the influence of phase decoherence

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