Storing single photons in atomic memories, and releasing them at a later time, is a required step on the way to quantum repeaters and long-distance quantum cryptography networks. This step has now been taken.
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Grangier, P. Remember that photon. Nature 438, 749–750 (2005). https://doi.org/10.1038/438749a
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DOI: https://doi.org/10.1038/438749a
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