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• W3171930336 abstract "Abstract Non-classical photon sources are a crucial resource for distributed quantum networks. Photons generated from matter systems with memory capability are particularly promising, as they can be integrated into a network where each source is used on-demand. Among all kinds of solid state and atomic quantum memories, room-temperature atomic vapours are especially attractive due to their robustness and potential scalability. To-date room-temperature photon sources have been limited either in their memory time or the purity of the photonic state. Here we demonstrate a single-photon source based on room-temperature memory. Following heralded loading of the memory, a single photon is retrieved from it after a variable storage time. The single-photon character of the retrieved field is validated by the strong suppression of the two-photon component with antibunching as low as $${g}_{{rm{RR| W = 1}}}^{(2)}=0.20pm 0.07$$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:msubsup> <mml:mrow> <mml:mi>g</mml:mi> </mml:mrow> <mml:mrow> <mml:mi>RR∣W=1</mml:mi> </mml:mrow> <mml:mrow> <mml:mrow> <mml:mo>(</mml:mo> <mml:mrow> <mml:mn>2</mml:mn> </mml:mrow> <mml:mo>)</mml:mo> </mml:mrow> </mml:mrow> </mml:msubsup> <mml:mo>=</mml:mo> <mml:mn>0.20</mml:mn> <mml:mo>±</mml:mo> <mml:mn>0.07</mml:mn> </mml:math> . Non-classical correlations between the heralding and the retrieved photons are maintained for up to $${tau }_{{rm{NC}}}^{{mathcal{R}}}=(0.68pm 0.08) {rm{ms}}$$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:msubsup> <mml:mrow> <mml:mi>τ</mml:mi> </mml:mrow> <mml:mrow> <mml:mi>NC</mml:mi> </mml:mrow> <mml:mrow> <mml:mi>R</mml:mi> </mml:mrow> </mml:msubsup> <mml:mo>=</mml:mo> <mml:mrow> <mml:mo>(</mml:mo> <mml:mrow> <mml:mn>0.68</mml:mn> <mml:mo>±</mml:mo> <mml:mn>0.08</mml:mn> </mml:mrow> <mml:mo>)</mml:mo> </mml:mrow> <mml:mspace /> <mml:mi>ms</mml:mi> </mml:math> , more than two orders of magnitude longer than previously demonstrated with other room-temperature systems. Correlations sufficient for violating Bell inequalities exist for up to τ BI = (0.15 ± 0.03) ms." @default.
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• W3171930336 date "2021-06-17" @default.
• W3171930336 modified "2023-10-10" @default.
• W3171930336 title "Room-temperature single-photon source with near-millisecond built-in memory" @default.
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• W3171930336 doi "https://doi.org/10.1038/s41467-021-24033-8" @default.
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