Dalidet Romain, Mazeas Florent, Nitiss Edgars, Yakar Ozan, Stroganov Anton, Tanzilli Sébastien, Labonté Laurent, Brès Camille-Sophie
Opt Express. 2022 Mar 28;30(7):11298-11305. doi: 10.1364/OE.451621.
Integrated entangled photon-pair sources are key elements for enabling large-scale quantum photonic solutions and address the challenges of both scaling-up and stability. Here we report the first demonstration of an energy-time entangled photon-pair source based on spontaneous parametric down-conversion in silicon-based platform-stoichiometric silicon nitride (SiN)-through an optically induced second-order (χ) nonlinearity, ensuring type-0 quasi-phase-matching of fundamental harmonic and its second-harmonic inside the waveguide. The developed source shows a coincidence-to-accidental ratio of 1635 for 8 µW pump power. We report two-photon interference with remarkable near-perfect visibility of 99.36±1.94%, showing high-quality photonic entanglement without excess background noise. This opens a new horizon for quantum technologies requiring the integration of a large variety of building functionalities on a single chip.
集成纠缠光子对源是实现大规模量子光子解决方案的关键要素，可应对扩大规模和稳定性方面的挑战。在此，我们报告了首个基于硅基平台——化学计量比氮化硅（SiN）——中的自发参量下转换的能量-时间纠缠光子对源的演示，该演示通过光诱导二阶（χ）非线性实现，确保了波导内基波和谐波的0型准相位匹配。对于8 μW的泵浦功率，所开发的源显示出1635的符合与本底比。我们报告了双光子干涉，其具有99.36±1.94%的显著近乎完美的可见度，显示出无过量背景噪声的高质量光子纠缠。这为需要在单个芯片上集成多种构建功能的量子技术开辟了新的前景。
