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Quantum technologies could largely benefit from the control of quantumemitters in sub-micrometric size crystals. These are naturally prone to theintegration in hybrid devices, including heterostructures and complex photonicdevices. Currently available quantum emitters sculpted in nanocrystals sufferfrom spectral instability, preventing their use as single photon sources e.g.,for most quantum optics operations. In this work we report on unprecedentedperformances of single-photon emission from organic nanocrystals (average sizeof hundreds \SI{}{\nano\meter}), made of anthracene (Ac) and doped withdibenzoterrylene (DBT) molecules. The source has hours-long photostability withrespect to frequency and intensity, both at room and at cryogenic temperature.When cooled down to \SI{3}{K}, the 00-zero phonon line shows linewidth values(\SI{50}{MHz}) close to the lifetime-limit. Such optical properties in ananocrystalline environment make the proposed organic nanocrystals a uniquesingle-photon source for integrated photonic quantum technologies.

Photostable single-photon emission from self-assembled nanocrystals of polycyclic aromatic hydrocarbons