SU(1,1)复合分段中的参量下转换多参数误差缓解
Multi-Parameter Error Mitigation in Parametric Down-Conversion via SU(1, 1) Composite Segmentation
- Shahid Beheshti University（沙希德·贝赫什提大学）
机构由 AI 辅助整理，请以论文原文为准。
中文总结 AI 辅助
本研究提出基于SU(1,1)复合分段的参量下转换误差缓解方法，利用奇次谐波和坐标膨胀对称性实现多波长配置，并通过开环热光偏置拓宽角接受范围，在5°C窗口内维持高效且相位稳定的纠缠光子产生。
中文摘要 AI 辅助
自发参量下转换是产生非经典光的主要资源，然而由温度漂移、角度失准和畴制造误差引起的相位失配波动会降低光子对产生效率和相位稳定性。在此，我们分析了基于SU(1,1)空间动力学控制的复合分段在自发参量下转换中的误差缓解。我们证明，奇数次空间傅里叶谐波保持了误差消除的平坦性，光子对产生率渐近地按$m^{-2}$标度，而坐标膨胀对称性为将配置转换到不同工作波长（405、532和775纳米）提供了设计规范。此外，开环热光偏置可抵消离轴角度漂移，将90%效率的角接受半宽拓宽3.46倍，并且可容忍多达两个缺失的极化畴，而相对转换效率没有数值上可分辨的损失。在5°C的热窗口内，产生的光子对维持相对转换效率$\eta \ge 0.954$，建模的相位相干度量保持在0.95以上，为纠缠光子产生提供了一种结构稳健的方法，无需连续的闭环反馈稳定。
英文摘要
Spontaneous parametric down-conversion is a primary resource for generating non-classical light, yet phase mismatch fluctuations from temperature drift, angular misalignment, and domain fabrication errors reduce pair-generation efficiency and phase stability. Here, we analyze error mitigation in spontaneous parametric down-conversion using composite segmentation governed by SU(1, 1) spatial dynamics. We show that odd spatial Fourier harmonics preserve error-cancellation flatness with pair-generation rates scaling asymptotically as $m^{-2}$, while a coordinate-dilation symmetry provides a design prescription for translating configurations across distinct operating wavelengths (405, 532, and 775 nm). Furthermore, an open-loop thermo-optic bias counteracts off-axis angular drift to broaden the 90%-efficiency angular acceptance half-width by 3.46x, and up to two missing poling domains are tolerated with no numerically resolved loss in relative conversion efficiency. Across a 5$^\circ$C thermal window, the generated pairs sustain a relative conversion efficiency of $η\ge 0.954$ with the modeled phase-coherence metric remaining above 0.95, providing a structurally robust approach for entangled photon generation without requiring continuous closed-loop feedback stabilization.
