arXivDaily arXiv每日学术速递 周一至周五更新
arXiv quant-ph/0202108quant-phcond-mat.mes-hallcond-mat.stat-mech
收藏

海森堡自旋链中的量子纠缠和贝尔不等式

Quantum entanglement and Bell inequalities in Heisenberg spin chains

Xiaoguang Wang, Paolo Zanardi

摘要:

我们证明了在一维各向同性海森堡模型中,两量子比特的热纠缠和对贝尔不等式的最大破坏与一个量子态函数直接相关,即,内部的内能。因此,它们完全由热力学的中心目标配分函数决定。对于铁磁环,我们证明了在任何温度下都不存在热纠缠。给出了并发性与最大违反贝尔不等式的测度之间的显式关系。

英文摘要:

We show that in one-dimensional isotropic Heisenberg model two-qubit thermal entanglement and maximal violation of Bell inequalities are directly related with a thermodynamical state function, i.e., the internal energy. Therefore they are completely determined by the partition function, the central object of thermodynamics. For ferromagnetic ring we prove that there is no thermal entanglement at any temperature. Explicit relations between the concurrence and the measure of maximal Bell inequality violation are given.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑