The energy-level crossing behavior and quantum Fisher information in a quantum well with spin-orbit coupling.
The energy-level crossing behavior and quantum Fisher information in a quantum well with spin-orbit coupling.
复制标题
自旋轨道耦合量子阱中的能级交叉行为和量子Fisher信息
DOI：
10.1038/srep22347
复制
发表时间：
2016-03-02
影响因子：
4.6
通讯作者：
Li Y
中科院分区：
文献类型：
--
作者：
Wang ZH;Zheng Q;Wang X;Li Y
研究了具有Rashba和Dresselhaus自旋轨道耦合的二维量子阱中的能级交叉行为。通过将自组织系统的哈密顿量映射到各向异性的Rabi模型上，通过幺正变换得到了近似基态及其量子Fisher信息。我们发现，能级交叉可以发生在量子阱系统中的可用参数，而不是在腔和电路量子电动力学系统。进一步研究了两种SOC对QFI的影响，并从稳态微扰理论的角度给出了直观的解释。
We study the energy-level crossing behavior in a two-dimensional quantum well with the Rashba and Dresselhaus spin-orbit couplings (SOCs). By mapping the SOC Hamiltonian onto an anisotropic Rabi model, we obtain the approximate ground state and its quantum Fisher information (QFI) via performing a unitary transformation. We find that the energy-level crossing can occur in the quantum well system within the available parameters rather than in cavity and circuit quantum eletrodynamics systems. Furthermore, the influence of two kinds of SOCs on the QFI is investigated and an intuitive explanation from the viewpoint of the stationary perturbation theory is given.