Dense Coding in Two Kinds of Two-Qubit Spin Squeezing Model
International Journal of Theoretical Physics(2019)
摘要
We investigate the effects of spin squeezing interaction, external magnetic field and temperature on dense coding capacity properties in two kinds of two-qubit spin squeezing model: one-axis twisting model (OATM) and two-axis countertwisting model (TACM). To the OATM, it is found that the value of dense coding capacity χ is larger than 1 in the region of larger values of Ω(external magnetic filed) and μ (squeezing interaction) parameters space, while in the region of lower values of Ω and μ parameters space, χ is always less than 1 and not valid for dense coding. With increasing temperature T the dense coding capacity is decayed, and one can carry out the valid dense coding in the lower T region through tuning Ω. To the TACM, it is found that the value of χ is promoted with increasing the squeezing parameter γ . Through increasing γ , χ finally reached to one stable value, which is always larger than 1 whatever value of Ω is. The valid dense coding capacity χ can be enhanced through tuning the parameter Ω or γ , but it is decreased with increasing T . Our results show that with proper enhancing the parameter Ω or γ it is easy to carry out the valid dense coding ( χ > 1) and the optimal dense coding ( χ = 2) when the system in TACM.
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关键词
Spin squeezing model, Optimal dense coding
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