Quantum waves can have stronger correlations than classical ones because of their particle nature. This effect has now been observed using quantum sound waves travelling in an acoustic waveguide.
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The authors declare no competing interests.
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Yamaguchi, H., Hatanaka, D. Quantum echoes. Nat. Phys. 18, 734–735 (2022). https://doi.org/10.1038/s41567-022-01625-9