Stable and pure single-photons from greener quantum dots – Nature Nanotechnology

Single-photons are key elements for many proposed schemes of modern quantum information technologies. Nanometre-size semiconductor crystals epitaxially grown on substrates, called epitaxial Quantum dots (QDs), represent the state-of-the-art of single-photon emitters¹. These QDs, however, are very expensive to produce, and have poor reproducibility and scalability. By contrast, colloidal QDs, which are another type of QDs often studied by chemists, can be precisely synthesized in large quantities from solution at low cost². But implementation of these colloidal dots as single-photon sources has been hindered by issues of intermittent emission (dubbed ‘blinking’)³, large linewidth (indicating short coherence time) and spectral fluctuation arising from a so-called quantum-confined Stark effect⁴. Now, writing in Nature Nanotechnology, Proppe et al. report highly stable, coherent and pure single-photons emitted from engineered colloidal core/shell QDs made of environmentally-benign elements⁵.

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• Source: https://www.nature.com/articles/s41565-023-01428-w