Optimal teleportation via thermal entangled states of a two-qubit Heisenberg chain
Optimal teleportation via thermal entangled states of a two-qubit Heisenberg chain
复制标题
通过两个量子位海森堡链的热纠缠态实现最佳隐形传态
DOI：
10.1209/0295-5075/86/50004
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发表时间：
2009-05
期刊：
影响因子：
1.8
通讯作者：
Ahmad Abliz
中科院分区：
文献类型：
--
作者：
Shu-Shen Li;Yue Zhou;Guo-Feng Zhang;Ahmad Abliz
在Dzyaloshinsky-Moriya （DM）各向异性反对称相互作用下，利用海森堡XXX链的热态研究了基于Bell测量的最优隐形传态，得到了最优的酉变换。给出了输出状态和传送保真度的显式表达式，并与标准协议进行了比较。结果表明，该协议具有较高的传送保真度，并能在零温度下实现单位保真度。与标准协议中的交互作用相反，DM交互作用可以在有限温度下提高隐形传态的保真度。其他各向异性的情况也进行了讨论。
We study the optimal teleportation based on Bell measurements via the thermal states of a two-qubit Heisenberg XXX chain in the presence of the Dzyaloshinsky-Moriya (DM) anisotropic antisymmetric interaction and obtain an optimal unitary transformation. The explicit expressions of the output state and the teleportation fidelity are presented and compared with those of the standard protocol. It is shown that in this protocol the teleportation fidelity is always larger and the unit fidelity is achieved at zero temperature. The DM interaction can enhance the teleportation fidelity at finite temperatures, as opposed to the effect of the interaction in the standard protocol. Cases with other types of anisotropies are also discussed.