论文标题
物质场汉密尔顿II的量子相图：Wigner功能分析
Quantum Phase Diagrams of Matter-Field Hamiltonians II: Wigner Function Analysis
论文作者
论文摘要
非古典状态在量子计算和量子计量学方面具有实际感兴趣。这些状态可以通过某些地区的Wigner函数负面影响来检测。在本文中，我们计算单个原子的三级广义DICKE模型的基态，并使用Fidelity Criterion确定其相图的结构。我们还通过相应的降低密度矩阵计算基态电磁模式的Wigner函数，并在相图中显示存在纠缠的区域。通过计算最大Bures距离的表面，获得了连续相变的较细分类。
Non-classical states are of practical interest in quantum computing and quantum metrology. These states can be detected through their Wigner function negativity in some regions. In this paper, we calculate the ground state of the three-level generalised Dicke model for a single atom and determine the structure of its phase diagram using a fidelity criterion. We also calculate the Wigner function of the electromagnetic modes of the ground state through the corresponding reduced density matrix, and show in the phase diagram the regions where entanglement is present. A finer classification for the continuous phase transitions is obtained through the computation of the surface of maximum Bures distance.
