含Dzyaloshinski-Moriya相互作用的三量子位HeisenbergXX链的热纠缠  

Thermal Entanglement in a Three-qubit Heisenberg XX Model with Dzyaloshinski-Moriya Interaction

作　　者：谢利军[1,2] 张登玉[1] 唐世清[1,2] 詹孝贵[1] 陈银花[1] 游开明[1] 高峰[1] 

机构地区：[1]衡阳师范学院物理与电子信息科学系,湖南衡阳421008 [2]湘潭大学材料与光电物理学院,湖南湘潭411005

出　　处：《量子光学学报》2010年第2期93-100,共8页Journal of Quantum Optics

基　　金：湖南省教育厅重点资助项目(09A013)

摘　　要：研究了外加磁场下具有Dzyaloshinski-Moriya(DM)各向异性反对称相互作用的三量子位Heisenberg XX链的对热纠缠以及在热平衡下用该链作为信道来传输未知的量子态。详细地给出了磁场、DM相互作用及温度对热纠缠和平均传输保真度的影响。结果表明:磁场和DM相互作用可以有效地调控对热纠缠;在温度较低情况下,关闭磁场和DM相互作用,顺铁磁链可以很好地用来做隐形传态的信道;纠缠不能完全反映平均传输保真度,相同的纠缠可以导致不同的平均传输保真度。Thermal pairwise entanglement of a three-qubit Heisenberg XX chain with the Dzyaloshinski-Moriya （DM） anisotropic antisymmetric interaction under an external magnetic field and quantum teleportation when using the Heisenberg chain as a channel are investigated. The entanglement and fidelity depending on the DM interaction, magnetic field and temperature are given in detail. The results show that the thermal entanglement can be controlled by magnetic field and DM interaction. Quantum teleportation will be better realized via an ferromagnetic spinchain when the DM interaction and external magnetic field are turned off and the temperature is low. The thermal entanglement cannot completely reflect the teleportation fidelity, and the same thermal entanglement could yield different average teleportation fidelities.

关 键 词：热纠缠 量子隐形传态 保真度 磁场 Dzyaloshinski-Moriya相互作用 

分 类 号：O431[机械工程—光学工程]