论文标题
分散工程薄膜锂尼贝特的频谱可分离光子对生成
Spectrally separable photon-pair generation in dispersion engineered thin-film lithium niobate
论文作者
论文摘要
现有的纯，未经过滤的宣传单光子来源的非线性实现不能提供密集的集成量子网络所需的可扩展性。此外，由于其材料分散，荷兰锂迄今不适合这种使用。我们设计了在快速出现的薄膜硅锂平台中波导的色散和准匹配条件，以在电信带中生成可分离的光子对。这种光子对可以用作量子网络中的频谱纯宣传单光子源。我们根据关节频谱强度测量值估计了$ {>} 94 \％$的预言频谱纯度。此外，对未释放时间集成的二阶相关函数的联合光谱相敏感测量得出的宣布状态纯度为$（86 \ pm 5）\％$。
Existing nonlinear-optic implementations of pure, unfiltered heralded single-photon sources do not offer the scalability required for densely integrated quantum networks. Additionally, lithium niobate has hitherto been unsuitable for such use due to its material dispersion. We engineer the dispersion and the quasi-phasematching conditions of a waveguide in the rapidly emerging thin-film lithium niobate platform to generate spectrally separable photon pairs in the telecommunications band. Such photon pairs can be used as spectrally pure heralded single-photon sources in quantum networks. We estimate a heralded-state spectral purity of ${>}94\%$ based on joint spectral intensity measurements. Further, a joint spectral phase-sensitive measurement of the unheralded time-integrated second-order correlation function yields a heralded-state purity of $(86 \pm 5)\%$.
