Topological and Symmetry-Broken Nano-Photonic Structures with Embedded Quantum Dots

This thesis explores directional light–matter interactions and mode manipulation in quantum photonic circuits, focusing on photonic crystal structures, both topologically trivial and non-trivial, with embedded quantum dots. The results are presented in four journal-style articles that advance the understanding and development of quantum photonic devices. In the first study, I employ quantum dots in waveguide-coupled nanocavities to demonstrate tunable, spin-dependent directional emission of single photons, achieving significant Purcell enhancement and chiral contrast. Next, I utilize topological band gap engineering to create an efficient, compact mode taper that facilitates scalable optical systems and enhanced integration of quantum emitters. In the third article, I introduce a topological add-drop filter that achieves multiport chiral emission and wavelength-selective routing. Finally, I provide a comparative analysis of topological and conventional waveguides. Collectively, this thesis assesses the feasibility and efficiency of topological and conventional waveguides, offering critical insights into the design of on-chip quantum nonlinearities and laying the groundwork for complex, integrated quantum photonic devices.