瑞利-伍德阈值控制原子阵列中的非线性光子关联
Rayleigh-Wood Threshold Controls Nonlinear Photon Correlations in Atomic Arrays
- Center for Quantum Sciences and School of Physics, Northeast Normal University（量子科学中心与物理学院，东北师范大学）
机构由 AI 辅助整理，请以论文原文为准。
AI总结：
该研究揭示瑞利-伍德异常可精确控制原子阵列中光子散射，通过衍射阈值调控非线性关联，为量子非线性光学提供新机制。
AI中文摘要：
二维原子阵列通过将光子耦合到集体晶格模式，提供了多功能自由空间量子光学接口。在这里，我们展示了瑞利-伍德异常为单原子层的线性和非线性光子散射提供了一种尖锐的控制机制。当晶格间距跨越衍射阈值时，新开放的辐射通道迅速拓宽主导集体模式，将镜面反射转变为漫射离轴散射。在透射中，入射场与集体散射场之间的动量空间法诺干涉产生单光子强度零点，强烈重塑动量空间关联模式。一个集成的非线性对比揭示了明显的通道不对称性：在打开瑞利通道后，透射中连接的双光子贡献相对于因子化背景下降了几个数量级，而在反射中则保持接近单位。这些结果确立了辐射衍射阈值作为单层原子阵列中量子非线性光学的一种控制原理。
英文摘要：
Two-dimensional atomic arrays provide versatile free-space quantum optical interfaces by coupling photons to collective lattice modes. Here we show that the Rayleigh--Wood anomaly provides a sharp control mechanism for both linear and nonlinear photon scattering from a single atomic layer. As the lattice spacing crosses the diffraction threshold, newly opened radiative channels rapidly broaden the dominant collective modes, converting specular reflection into diffuse off-axis scattering. In transmission, momentum-space Fano interference between the incident and collectively scattered fields produces single-photon intensity zeros that strongly reshape the momentum-space correlation pattern. An integrated nonlinear contrast reveals a pronounced channel asymmetry: upon opening the Rayleigh channels, the connected two-photon contribution drops by several orders of magnitude relative to the factorized background in transmission, while remaining close to unity in reflection. These results establish radiative diffraction thresholds as a control principle for quantum nonlinear optics in single-layer atomic arrays.
