The study investigates single-photon superradiance in individual CsPbX₃ (X = Cl, Br, I) perovskite quantum dots (QDs), achieving sub-100 ps radiative decay times, comparable to the reported exciton coherence time. The findings suggest the formation of giant transition dipoles, confirmed by effective-mass calculations. The results highlight the potential for ultrabright, coherent quantum light sources and demonstrate that quantum effects, such as single-photon emission, persist in nanoparticles ten times larger than the exciton Bohr radius. The research also explores the size-, temperature-, and composition-dependent radiative lifetimes, providing a comprehensive understanding of the cooperative emission process. The findings contribute to the development of scalable and integrable material platforms for quantum applications.The study investigates single-photon superradiance in individual CsPbX₃ (X = Cl, Br, I) perovskite quantum dots (QDs), achieving sub-100 ps radiative decay times, comparable to the reported exciton coherence time. The findings suggest the formation of giant transition dipoles, confirmed by effective-mass calculations. The results highlight the potential for ultrabright, coherent quantum light sources and demonstrate that quantum effects, such as single-photon emission, persist in nanoparticles ten times larger than the exciton Bohr radius. The research also explores the size-, temperature-, and composition-dependent radiative lifetimes, providing a comprehensive understanding of the cooperative emission process. The findings contribute to the development of scalable and integrable material platforms for quantum applications.