THE QUANTUM INTELLIGENCER

A single organic molecule has delivered 100 million photons per second into the first lens of the collecting optics, gathered there by a cryogenic planar metallo-dielectric antenna at a collection efficiency of 97 per cent. The emitter is a dibenzoterrylene molecule, a species long known at cryogenic temperatures for Fourier-limited emission, virtually unlimited photostability, and emission wavelengths selectable by molecular design. What the new account adds is the directing of that light: the report measures a photon indistinguishability of 91.2 per cent on the Fourier-limited transition and a single-photon purity of 97.7 per cent, under strong continuous-wave and pulsed excitation. For those who keep the longer ledgers of quantum metrology, secure communication and photonic quantum information processing, the interest lies less in the number than in the settling of a difficulty. Organic emitters had long promised stable single photons, yet their efficient integration with photonic microstructures remained the open problem, limiting how much light could be collected from a single molecule in its cryogenic station. That obstacle is here addressed, and the report draws the natural conclusion: organic molecules now stand as a high-performance platform for single-photon generation, an important step towards scalable organic quantum photonic technologies. —Dr. Octavia Blythe Dispatch from The Prepared E0