This supplementary material provides detailed supplementary figures and tables for the study of spin angular momentum-encoded single-photon emitters in a chiral nanoparticle-coupled WSe₂ monolayer. The key components include: 1. **Fig. S1**: Schematic and SEM image of 2D silica-coated chiral nanoparticles (cNPs), detailing their structural parameters and morphology. 2. **Fig. S2**: Optical measurement setup, including the pump beam, sample scanning, and detection methods for PL emission. 3. **Fig. S3**: Step-by-step fabrication process of a large-scale 2D array of cNPs, involving PDMS nano-well array insertion, transfer to SiO₂ substrate, and formation of strained WSe₂ monolayer. 4. **Fig. S4**: Single-photon characteristics of additional emitters, showing their spectra and second-order time correlation functions (g^(2)(τ)). 5. **Fig. S5**: Numerical calculations for an achiral metal nanocube, demonstrating polarization of the radiation field and Stokes parameters. 6. **Fig. S6**: Single-photon emitter on a metal substrate (Au), showing strong field enhancement, PL intensity, spectrum, and photon correlation function. Additionally, **Table S1** and **Table S2** provide detailed peak wavelengths and Stokes parameters for the single-photon emitters coupled with cNPs and Au nanocubes, respectively.This supplementary material provides detailed supplementary figures and tables for the study of spin angular momentum-encoded single-photon emitters in a chiral nanoparticle-coupled WSe₂ monolayer. The key components include: 1. **Fig. S1**: Schematic and SEM image of 2D silica-coated chiral nanoparticles (cNPs), detailing their structural parameters and morphology. 2. **Fig. S2**: Optical measurement setup, including the pump beam, sample scanning, and detection methods for PL emission. 3. **Fig. S3**: Step-by-step fabrication process of a large-scale 2D array of cNPs, involving PDMS nano-well array insertion, transfer to SiO₂ substrate, and formation of strained WSe₂ monolayer. 4. **Fig. S4**: Single-photon characteristics of additional emitters, showing their spectra and second-order time correlation functions (g^(2)(τ)). 5. **Fig. S5**: Numerical calculations for an achiral metal nanocube, demonstrating polarization of the radiation field and Stokes parameters. 6. **Fig. S6**: Single-photon emitter on a metal substrate (Au), showing strong field enhancement, PL intensity, spectrum, and photon correlation function. Additionally, **Table S1** and **Table S2** provide detailed peak wavelengths and Stokes parameters for the single-photon emitters coupled with cNPs and Au nanocubes, respectively.