Publication date: 21st July 2025
Mastering light-matter interaction lies at the heart of quantum technologies – the Purcell effect, for instance, has been instrumental in generating indistinguishable photons with high quantum efficiency [1]. A promising frontier in this field aligns towards the chiroptical regime which may unlock unconventional nonreciprocity and chiral quantum photonics [2,3], while achieving a full control over single-photon chirality remains a major challenge. Here, we demonstrate a highly efficient chiral single-photon source by transducing the strong local optical helicity of the gold helicoid into a single perovskite quantum dot (PQD) that serve as a nanoprobe, in a non-invasive and non-averaged manner. By fine-tuning the near-field coupling and the excitonic and plasmonic spectral resonances, we achieved single-photon chirality as high as 80% and an excitation dissymmetry factor reaching 90%, achieving a full optical chirality (excitation-emission) with a near-unity efficiency. These results are accompanied by rapid radiative decay (~300 ps) and a Purcell enhancement factor of approximately 3. Electromagnetic simulations reveal that chiral field enhancement arises from circulating surface currents unique to the helicoid nanogeometry. Furthermore, we present a prototype of a switchable circular dichroism probe that leverages excitation-wavelength-dependent enantiospecificity. Our results set a new benchmark in solid-state chiral quantum light sources and offer a versatile platform for next-generation on-chip quantum photonics and nanoscale chiroptical sensing.
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