Imprinting a coherent light pulse on the spins of atoms is standard quantum sorcery. Retrieving the same light pulse from a second, distant set of atoms looks rather like black magic. But it, too, is just quantum mechanics.
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Fleischhauer, M. Indistinguishable from afar. Nature 445, 605–606 (2007). https://doi.org/10.1038/445605a
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DOI: https://doi.org/10.1038/445605a
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