Overview
- The peer-reviewed study in Nature Materials reports a BAQIS–Chinese Academy of Sciences device led by Yuan Zhiliang, with external praise from Leibniz University’s Ding Fei.
- Under pulsed excitation, 98.3% of emitted photons appeared as pairs with 29.9% pair-generation efficiency, and the two-photon correlation g²(0) measured about 3.97.
- The emitter places a single quantum dot in a microscopic pillar cavity, leveraging the Purcell effect and a dark-exciton route via polarization-selective p-shell excitation to drive a biexciton–exciton cascade.
- The single-emitter semiconductor approach offers on-demand pair production with reduced multi-pair noise compared with probabilistic nonlinear-crystal sources.
- Researchers aim to raise the operating temperature and refine pair quality, with potential uses in precision measurement, quantum imaging, secure communications, and advanced sensing.