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We report the observation of room-temperature superradiance from single,highly luminescent diamond nanocrystals with spatial dimensions much smallerthan the wavelength of light, and each containing a large number (~10^3) ofembedded nitrogen-vacancy (NV) centres. After excitation of the nanodiamondswith an off-resonant, green laser pulse, we observe i) ultrafast radiativelifetimes down to ~ 1 ns, and ii) super-Poissonian photon bunching in theautocorrelation function of the light emitted from the fastest nanodiamonds. Weexplain our findings with a detailed theoretical model based on collectiveDicke states and well-known properties of NV centres. Using a minimal set offit parameters, the model captures both the wide range of different lifetimesand the nontrivial photon correlations found in the experiments. The resultspave the way towards a systematic study of superradiance in a well controlled,solid-state quantum system at room temperature. Ultimately, quantum engineeringof superradiance in diamond has the potential for advancing applications inquantum sensing, energy harvesting, and efficient photon detection.

Observation of room-temperature spontaneous superradiance from single diamond nanocrystals