Quantum Dense Coding About a Two-Qubit Heisenberg XYZ Model |
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Authors: | Hui-Yun Xu Guo-Hui Yang |
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Institution: | 1.College of Physics and Electronics Engineering,Shanxi University,Taiyuan,People’s Republic of China;2.School of Physics and Information Engineering,Shanxi Normal University,Linfen,People’s Republic of China |
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Abstract: | By taking into account the nonuniform magnetic field, the quantum dense coding with thermal entangled states of a two-qubit anisotropic Heisenberg XYZ chain are investigated in detail. We mainly show the different properties about the dense coding capacity (χ) with the changes of different parameters. It is found that dense coding capacity χ can be enhanced by decreasing the magnetic field B, the degree of inhomogeneity b and temperature T, or increasing the coupling constant along z-axis J z . In addition, we also find χ remains the stable value as the change of the anisotropy of the XY plane Δ in a certain temperature condition. Through studying different parameters effect on χ, it presents that we can properly turn the values of B, b, J z , Δ or adjust the temperature T to obtain a valid dense coding capacity (χ satisfies χ > 1). Moreover, the temperature plays a key role in adjusting the value of dense coding capacity χ. The valid dense coding capacity could be always obtained in the lower temperature-limit case. |
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