A research team led by Yuan Zhiliang from the Beijing Academy of Quantum Information Sciences, in collaboration with Niu Zhichuan’s team at the Institute of Semiconductors, Chinese Academy of Sciences, has achieved a significant breakthrough in solid-state quantum light source research. They have successfully developed a two-photon emitter that combines both high efficiency and high purity. Traditional light sources often face interference issues when generating two photons, resulting in outputs that are impure and unstable. Meanwhile, techniques based on single quantum dots tend to suffer from low efficiency and inadequate purity. To overcome these limitations, the research team significantly enhanced the two-photon emission efficiency by employing a unique excitation method to regulate the semiconductor quantum dot micro-pillar cavity structure and leveraging the energy level degeneracy characteristics. The newly developed quantum light source exhibits remarkable two-photon bunching effects. Under pulsed excitation, 98.3% of the emitted photons appear in pairs, achieving a two-photon emission efficiency of 29.9%—a level that leads internationally. Furthermore, the team has elucidated its luminescence mechanism, providing solid theoretical support for future optimizations.