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

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

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.

Keywords: dense coding intrinsic decoherence DM interaction

Received: 03 July 2010
Revised: 17 January 2011
Accepted manuscript online:

PACS:	03.67.-a	(Quantum information)
	03.65.Ud	(Entanglement and quantum nonlocality)
	75.10.Pq	(Spin chain models)

Fund: 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).

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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 2011 Chin. Phys. B 20 050305

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

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