4.8 Article

Room-temperature single-photon source with near-millisecond built-in memory

Journal

NATURE COMMUNICATIONS
Volume 12, Issue 1, Pages -

Publisher

NATURE RESEARCH
DOI: 10.1038/s41467-021-24033-8

Keywords

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Funding

  1. European Research Council Advanced grant QUANTUM-N
  2. Villum Foundation
  3. John Templeton Foundation

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A single-photon source based on room-temperature memory has been demonstrated, with improved purity and storage time of the photonic state. The non-classical correlations between the heralding and the retrieved photons are maintained for an extended period, surpassing previous demonstrations with other room-temperature systems.
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(RR|W=1)((2)) = 0:20 +/- 0:07. Non-classical correlations between the heralding and the retrieved photons are maintained for up to tau(R)(NC) = (0:68 +/- 0:08) ms, 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 tau(BI) = (0.15 +/- 0.03) ms.

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