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Near transform-limited single photon sources are required for perfect photonindistinguishability in quantum networks. Having such sources in nanodiamondsis particularly important since it can enable engineering hybrid quantumphotonic systems. In this letter, we report the generation of optically stable,nearly transform-limited single silicon vacancy emitters in nanodiamonds. Linesas narrow as 325 MHz are reported, which is comparable to the lifetime limitedlinewidth. Moreover, the emitters exhibit minimal spectrum diffusion andabsolute photostability, even if pumped well above saturation. Our resultssuggest that nanodiamonds can host color centers with supreme propertiessuitable for hybrid photonic devices and quantum information.

CVD nanodiamonds with non-blinking, near transform-limited linewidths emitters