A technique for detecting the presence of a photon without destroying the quantum message it carries could ultimately lead to a loophole-free test of quantum non-locality.
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Lvovsky, A. A quantum delivery note. Nature Phys 9, 5–6 (2013). https://doi.org/10.1038/nphys2517
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DOI: https://doi.org/10.1038/nphys2517
