AI 中文总结
研究利用X切薄膜铌酸锂，通过自发参量下转换和自发四波混频，置于谐振腔增强非线性相互作用，实现了有80个通道的光子对源，跨越C和L光波段，表征了相关参数，证明其对量子光学应用有潜力。
AI 中文摘要
纳米光子平台具有产生相关光子对所需的多种特性。自发参量下转换（SPDC）和自发四波混频（SFWM）被用于产生光子对，将非线性区域置于谐振腔可增强非线性相互作用并按频率滤波。X切薄膜铌酸锂（TFLN）因二阶光学非线性强且有光调制平台而突出。此前光子对源通道有限，限制了量子应用潜力。本文展示了一个在X切TFLN上的光子对源，有80个测量通道，跨越C和L光波段，光子频率间距49.5GHz。对80个通道的二阶关联函数和对生成率（PGR）进行了表征，考虑腔逃逸效率后对生成率达125.7kHz/μW，还展示了预示单光子操作。这些发现证明了X切TFLN作为量子光学应用强大平台的潜力。
英文摘要
Nanophotonic platforms have multiple properties and features desirable for producing correlated photon pairs. In these platforms, spontaneous parametric down-conversion (SPDC) and spontaneous four-wave-mixing (SFWM) have been used to achieve photon pair production. By placing the nonlinear region in a resonant cavity, the source obtains an enhanced nonlinear interaction and naturally filters out photons by frequency according to the cavity linewidth. Among various platforms, X-cut thin-film lithium niobate (TFLN) stands out for its strong second-order optical nonlinearity ($χ^{(2)}$) and access to a strong platform for modulating light. Although previously demonstrated, present sources are limited in their photon pair channel availability, limiting the potential of quantum applications in quantum information processing, communication, and sensing that can scale in robustness by having access to multiple photon pair channels. To this end, we demonstrate a photon pair source on X-cut TFLN with 80 measured photon pair channels spanning the C and L optical bands with a frequency spacing of 49.5 GHz between photons. We characterize the second-order correlation function and pair generation rate (PGR) of 80 channels, the highest number of channels demonstrated to date, and achieve a pair generation of 125.7 kHz / μW after accounting for the cavity's escape efficiency. We also demonstrate heralded single photon operation by calculating a heralded auto-correlation dip of 0.0544 $\pm$ 0.0054 with 2.2 mW of on-chip pump power. These findings demonstrate the promise of X-cut TFLN as a strong platform for quantum optical applications.
Comments8 pages, 5 figures, 1 table
