AI 中文总结
该研究在腔-QED系统中提出结合相干驱动、色散原子-腔相互作用和原子后选择的测量方案，可实验可行地产生抗中等腔耗散的薛定谔猫态，无需强光学非线性或工程化耗散。
AI 中文摘要
薛定谔猫态代表宏观可区分态的相干叠加，是连续变量量子信息处理不可或缺的非经典资源。现有产生方案通常依赖强非线性相互作用、复杂控制技术或工程化耗散，给实验实现带来挑战。本文提出一种基于测量的简单方案，在腔-QED系统中结合相干驱动、色散原子-腔相互作用和原子后选择产生薛定谔猫态。原子-腔相互作用在原子和光子自由度间建立相干关联，后续原子后选择将腔场投影到具有显著维格纳负性的非高斯叠加态。基于林德布拉德主方程的数值模拟表明，产生的薛定谔猫态对中等腔耗散具有鲁棒性。研究结果证明，条件原子测量提供了一种有效且实验可行的方法，可在不依赖强光非线性或工程化耗散的情况下制备非经典腔态。
英文摘要
Schrödinger cat states, representing coherent superpositions of macroscopically distinguishable states, are indispensable nonclassical resources for continuous-variable quantum information processing. Existing generation protocols typically rely on strong nonlinear interactions, complicated control techniques, or engineered dissipation, posing challenges for experimental implementation. Here, we propose a simple measurement-based protocol for generating Schrödinger cat states in a cavity-QED system by combining coherent driving, dispersive atom--cavity interactions, and atomic postselection. The atom--cavity interaction establishes coherent correlations between the atomic and photonic degrees of freedom, while the subsequent atomic postselection projects the cavity field onto a non-Gaussian superposition state with pronounced Wigner negativity. Numerical simulations based on the Lindblad master equation show that the generated Schrödinger cat states remain robust against moderate cavity dissipation. Our results demonstrate that conditional atomic measurements provide an effective and experimentally accessible approach for preparing nonclassical cavity states without relying on strong optical nonlinearities or engineered dissipation.
Comments7 Pages, 3 Figures, Comments are welcomed
