Single-photons are key components for a lot of proposed schemes of contemporary quantum info applied sciences. Nanometre-size semiconductor crystals epitaxially grown on substrates, referred to as epitaxial Quantum dots (QDs), signify the state-of-the-art of single-photon emitters1. These QDs, nonetheless, are very costly to provide, and have poor reproducibility and scalability. Against this, colloidal QDs, that are one other sort of QDs typically studied by chemists, could be exactly synthesized in giant portions from resolution at low value2. However implementation of those colloidal dots as single-photon sources has been hindered by problems with intermittent emission (dubbed ‘blinking’)3, giant linewidth (indicating quick coherence time) and spectral fluctuation arising from a so-called quantum-confined Stark impact4. Now, writing in Nature Nanotechnology, Proppe et al. report extremely secure, coherent and pure single-photons emitted from engineered colloidal core/shell QDs manufactured from environmentally-benign components5.
