Weiss Tim F, Arianfard Hamed, Yang Yang, Peruzzo Alberto
Quantum Photonics Laboratory and Centre for Quantum Computation and Communication Technology, RMIT University, Melbourne, VIC, 3000, Australia.
Quandela, Massy, France.
Sci Rep. 2025 Mar 24;15(1):10136. doi: 10.1038/s41598-025-92705-2.
State-of-the-art photon sources based on spontaneous parametric down-conversion (SPDC) currently rely on artificial structuring of the material nonlinearity to satisfy phase-matching conditions. This technique, known as periodic poling, is available only in a limited number of material platforms and introduces additional fabrication steps and errors, which are detrimental to up-scaling efforts. Here, we present a device architecture that enables SPDC of a wide range of frequencies without the need for periodic poling. We present explicit designs and calculations for 4H Silicon Carbide on-insulator, in which SPDC photon generation is so far unavailable, and thin-film Lithium Niobate on-insulator, a state-of-the-art quantum photonics platform. Our design, based on mode conversion and subsequent modal phase-matched SPDC, facilitates a CMOS compatible [Formula: see text] platform, and simplifies photon sources by removing the requirement of periodic poling and the associated additional fabrication complexity.
基于自发参量下转换（SPDC）的先进光子源目前依赖于对材料非线性进行人工结构化处理以满足相位匹配条件。这种被称为周期极化的技术仅在有限数量的材料平台上可用，并且会引入额外的制造步骤和误差，这对扩大规模的努力不利。在此，我们展示了一种无需周期极化就能实现宽频率范围SPDC的器件架构。我们给出了绝缘体上4H碳化硅（目前尚无SPDC光子产生）和绝缘体上薄膜铌酸锂（一种先进的量子光子学平台）的具体设计和计算。我们基于模式转换及随后的模式相位匹配SPDC的设计，促成了一个与CMOS兼容的[公式：见原文]平台，并通过消除周期极化要求及相关的额外制造复杂性简化了光子源。
