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Heralded single-photon sources with on-demand readout are promisingcandidates for quantum repeaters enabling long-distance quantum communication.The need for scalability of such systems requires simple experimentalsolutions, thus favouring room-temperature systems. For quantum repeaterapplications, long delays between heralding and single-photon readout arecrucial. Until now, this has been prevented in room-temperature atomic systemsby fast decoherence due to thermal motion. Here we demonstrate efficientheralding and readout of single collective excitations created in warm caesiumvapour. Using the principle of motional averaging we achieve a collectiveexcitation lifetime of $0.27\pm 0.04$ ms, two orders of magnitude larger thanpreviously achieved for single excitations in room-temperature sources. Weexperimentally verify non-classicality of the light-matter correlations byobserving a violation of the Cauchy-Schwarz inequality with $R=1.4\pm 0.1>1$.Through spectral and temporal analysis we identify intrinsic four-wave mixingnoise as the main contribution compromising single-photon operation of thesource.

Long-lived non-classical correlations for scalable quantum repeaters at room temperature