Realizing deterministic and bright single-photon sources with minimal two-photon probability at room temperature is essential for quantum communication, computation, and sensing. Solid-state quantum emitters, particularly nitrogen-vacancy (N-$V$) centers in diamond, are prime candidates for single-photon emission and spin addressability but suffer from limited photon extraction efficiency and higher two-photon probability. Here, we demonstrate efficient coupling of single N-$V$ centers in diamond nanowaveguides to guided optical modes, enabling enhanced single-photon outcoupling with low two-photon probability. By optimizing excitation and collection geometry, we achieve a single-photon count rate of approximately $2\text{Mcps}$ along with a low two-photon probability of $g^{(2)}(0)=0.014\pm 0.004$. The nanowaveguide architecture overcomes alignment and bandwidth constraints of resonant cavities, providing a scalable, fabrication-compatible route for bright single-photon sources.

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• Integrated optics
• Magneto-optics
• Optical quantum information processing
• Quantum sensing
• Single photon sources
• Nanotechnology
• Nitrogen vacancy centers in diamond
• Optical sources & detectors
• Waveguides
• Optically detected magnetic resonance