The Hong–Ou–Mandel effect, whereby two identical quantum particles launched into the two input ports of a 'beam-splitter' always bunch together in the same output port, has now been demonstrated for helium-4 atoms. See Letter p.66
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References
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LeBlanc, L. Two-atom bunching. Nature 520, 36–37 (2015). https://doi.org/10.1038/520036a
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DOI: https://doi.org/10.1038/520036a
