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The interest in perovskite nanocrystals (NCs) such as CsPbBr$_3$ for quantumapplications is rapidly raising, as it has been demonstrated that they canbehave as very efficient single photon emitters. The main problem to tackle inthis context is their photo-stability under optical excitation. In thisarticle, we present a full analysis of the optical and quantum properties ofhighly efficient perovskite nanocubes synthesized with an established method,which is used for the first time to produce quantum emitters, and is shown toensure an increased photostability. These emitters exhibit reduced blinkingtogether with a strong photon antibunching. Remarkably these features arehardly affected by the increase of the excitation intensity well above theemission saturation levels. Finally, we achieve for the first time the couplingof a single perovskite nanocube with a tapered optical nanofiber in order toaim for a compact integrated single photon source for future applications.

Highly photo-stable Perovskite nanocubes: towards integrated single photon sources based on tapered nanofibers