可调三角Ising系统中阻挫和非阻挫区的多体量子关联
Multipartite quantum correlations in the frustrated and nonfrustrated regimes of a tunable triangular Ising system
摘要：
研究了具有可调三角组态的量子横Ising系统中的多体量子关联（MQC），发现MQC本身并不总是能区分基态的阻挫区和非阻挫区，但MQC结合我们新定义的MQC磁化率可以完成这一任务.同时，我们揭示了空间各向异性耦合是一种有效的和可行的工具，MQC调制的基态的阻挫伊辛自旋。此外，我们分析了热态的多体关联特性，结果表明，与非阻挫制度中的热脆弱MQC不同，在高MQC、强热鲁棒性和阻挫自旋中的空间各向异性相互作用之间存在三方权衡关系。此外，本文还讨论了在光晶格中囚禁冷原子系统中利用各向异性耦合实现MQC调制的实验方案。
英文摘要：
We study the multipartite quantum correlation (MQC) in a quantum transverse Ising system with the tunable triangular configuration, where it is found that the MQC itself cannot always discriminate the frustrated and nonfrustrated regimes of the ground state but the MQC combined with our newly defined MQC susceptibility can complete the task. Meanwhile, we reveal that the spatially anisotropic coupling is an effective and feasible tool for the MQC modulation in the ground state of frustrated Ising spins. Furthermore, we analyze the multipartite correlation properties in the thermal state, where it is shown that, unlike the thermally fragile MQC in the nonfrustrated regimes, there is a three-way trade-off relation among high MQC, strong thermal robustness, and the spatially anisotropic interactions in the frustrated spins. In addition, an experimental scheme for the MQC modulation via the anisotropic coupling is discussed in the system of cold atoms trapped in an optical lattice.
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