We propose a hybrid silicon waveguide scheme to avoid the impact of noise photons induced by pump lights in application scenarios of quantum photonic circuits with quantum light sources. The scheme is composed of strip waveguide and shallow-ridge waveguide structures. It utilizes the difference of biphoton spectra generated by spontaneous four wave mixing (SFWM) in these two waveguides. By proper pumping setting and signal/idler wavelength selection, the generation of desired photon pairs is confined in the strip waveguide. The impact of noise photons generated by SFWM in the shallow-ridge waveguide could be avoided. Hence, the shallow-ridge waveguide could be used to realize various linear operation devices for pump light and quantum state manipulations. The feasibility of this scheme is verified by theoretical analysis and primary experiment. Two applications are proposed and analyzed, showing its great potential on silicon-based quantum photonic circuits.

中文翻译：

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用于具有量子光源的硅基量子光子电路的混合波导方案

我们提出了一种混合硅波导方案，以避免在具有量子光源的量子光子电路的应用场景中泵浦光引起的噪声光子的影响。该方案由条形波导和浅脊波导结构组成。它利用了这两个波导中自发四波混合 (SFWM) 产生的双光子光谱的差异。通过适当的泵浦设置和信号/空闲波长选择，所需光子对的产生被限制在带状波导中。可以避免 SFWM 在浅脊波导中产生的噪声光子的影响。因此，浅脊波导可用于实现泵浦光和量子态操纵的各种线性操作装置。通过理论分析和初步实验验证了该方案的可行性。