Quantum systems are uncertain by nature. By 'squeezing' this uncertainty, physicists can make better measurements of quantities such as distance. But overdoing it makes things burst out all over the place.
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Pryde, G. Squeeze until it hurts. Nature 457, 35–36 (2009). https://doi.org/10.1038/457035a
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DOI: https://doi.org/10.1038/457035a