Quantum steering in Heisenberg models with Dzyaloshinskii-Moriya interactions
Quantum steering in Heisenberg models with Dzyaloshinskii-Moriya interactions
复制标题
具有 Dzyaloshinskii-Moriya 相互作用的海森堡模型中的量子控制
DOI：
10.1088/1674-1056/27/12/120304
复制
发表时间：
2018
影响因子：
1.7
通讯作者：
Liang Chen
中科院分区：
文献类型：
--
作者：
Hui-Zhen Li;Rong-Sheng Han;Ye-Qi Zhang;Liang Chen
在这项工作中，我们研究了具有Dzyaloshinskii-Moriya(DM)相互作用和外加磁场的两量子比特Heisenberg模型中的量子操控。我们发现，DM相互作用可以提高可操纵性重量(Sw)和Sw→0的临界温度。在磁场为零且两自旋为铁磁耦合的特殊情况下，DM相互作用可以将零温Sw从零调整到一个有限的值。除了短波外，还研究了一些用于识别量子纠缠和量子关联的其他测量方法，即并发性、量子不协调性和相干的稳健性。在强磁场极限下，我们的结果表明，Sw与其他测量结果有很大的不同。
In this work, we study the quantum steering in two-qubit Heisenberg models with Dzyaloshinskii–Moriya (DM) interaction and an external magnetic field. We find that the steerable weight (SW) and the critical temperature where SW→ 0 can be enhanced by the DM interactions. In the special case where the magnetic field is vanishing and the two spins are ferromagnetically coupled, the DM interaction can tune the zero-temperature SW from zero to a finite value. In addition to the SW, some other measurements used to identify the quantum entanglement and quantum correlations are investigated, ie, the concurrence, the quantum discord, and the robustness of coherence. In the strong magnetic field limit, our results show that the SW is dramatically different from the other measurements.