具有挤压光的 Dicke 模型中的量子相变和纠缠熵

IF 1.5 4区 物理与天体物理 Q3 OPTICS The European Physical Journal D Pub Date : 2024-07-06 DOI:10.1140/epjd/s10053-024-00881-z
Li-Tuo Shen, Xuan-Tong Pei, Zhi-Cheng Shi, Zhen-Biao Yang
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引用次数: 0

摘要

摘要 研究了具有挤压光的 Dicke 模型中的超辐射相变和纠缠熵。我们发现了一个特殊的旋转坐标系,它将原始哈密顿映射为热力学极限下的有效双振荡器哈密顿。我们分析得出了基态的特征能和特征态。在挤压驱动和位元场耦合共同诱导的非线性临界边界处,基态发生了超辐射相变。这一相位边界既不需要大的量子比特场失谐,也不需要强的挤压驱动。我们得到了基态熵的精确表达式。我们证明,挤压光能线性增强量子比特-场纠缠熵。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

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Quantum phase transition and entanglement entropy in the Dicke model with a squeezed light

Superradiant phase transition and entanglement entropy in the Dicke model with a squeezed light are investigated. We find a special rotation coordinate system mapping the original Hamiltonian into an effective dual-oscillator Hamiltonian in the thermodynamic limit. We analytically derive the eigenenergy and eigenstate of the ground state. The ground state is demonstrated to undergo superradiant phase transition at a nonlinear critical boundary collectively induced by the squeezed driving and qubit-field coupling. This phase boundary requires neither large qubit-field detuning nor strong squeezed driving. An exact expression of the ground-state entropy is obtained. We demonstrate that the squeezed light enhances the qubit-field entanglement entropy linearly.

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来源期刊
The European Physical Journal D
The European Physical Journal D 物理-物理:原子、分子和化学物理
CiteScore
3.10
自引率
11.10%
发文量
213
审稿时长
3 months
期刊介绍: The European Physical Journal D (EPJ D) presents new and original research results in: Atomic Physics; Molecular Physics and Chemical Physics; Atomic and Molecular Collisions; Clusters and Nanostructures; Plasma Physics; Laser Cooling and Quantum Gas; Nonlinear Dynamics; Optical Physics; Quantum Optics and Quantum Information; Ultraintense and Ultrashort Laser Fields. The range of topics covered in these areas is extensive, from Molecular Interaction and Reactivity to Spectroscopy and Thermodynamics of Clusters, from Atomic Optics to Bose-Einstein Condensation to Femtochemistry.
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