A sensitive cold-ion experiment probes sound at the level of phonons, the fundamental quantum units of vibration. It shows that phonons mix in such a way that they can be classified as 'bosonic' particles, like photons. See Letter p.74
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Kielpinski, D. Quantum sound waves stick together. Nature 527, 45–46 (2015). https://doi.org/10.1038/527045a
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DOI: https://doi.org/10.1038/527045a
