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带有三体相互作用的XXZ自旋链模型的隐形传态
Quantum telep ortation in an XXZ spin chain system with three-site interaction
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摘要: 本文对基于海森堡XXZ自旋链模型的隐形传态的平均保真度进行了详细计算和分析。通过比较不带三体相互作用、仅带一种三体相互作用和同时带两种三体相互作用的各种海森堡铁磁质和反铁磁质XXZ模型在外磁场正向和反向时的保真度与外磁场和温度的关系，找到了一些理想模型，用这些模型进行隐形传态时需要的外界磁场相对较弱、温度相对较高，这个结论为实验上用海森堡XXZ模型进行隐形传态提供了很好的理论依据。Abstract: In this paper, we study carefully the quantum teleportation by means of a channel of a three-qubit Heisenberg XXZ ring, and calculate the fidelity of quantum teleportation. Comparing the four XXZ models: one without three-site interaction, one with XZX+Y ZY type three-site interaction, one with XZY -Y ZX type three-site interaction, one with both the two kinds of the three-site interaction, we find some ideal models by which the teleportation only needs a weakest magnetic field and a highest temperature to work successfully. The result could provide a theoretical basis for later experiments.
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