Among weakly interacting bosons, quantum fluctuations are akin to those of harmonic oscillators, and they manifest themselves through positive correlations between particles of opposite momenta. A quantum-gas experiment reveals that, by cranking up the interactions, these correlations are suppressed, and hence that quantum fluctuations become strong and anharmonic.
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References
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This is a summary of: Bureik, J.-P. et al. Suppression of Bogoliubov momentum pairing and emergence of non-Gaussian correlations in ultracold interacting Bose gases. Nat. Phys. https://doi.org/10.1038/s41567-024-02700-z (2025).
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Large quantum fluctuations observed in strongly interacting bosons. Nat. Phys. 21, 19–20 (2025). https://doi.org/10.1038/s41567-024-02701-y
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DOI: https://doi.org/10.1038/s41567-024-02701-y
