Entanglement between particles permits the quantum uncertainty in one variable to be reduced at the cost of increasing that in another. Condensates are an ideal system in which this technique can be studied.
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Sackett, C. A condensate's main squeeze. Nature 464, 1133–1134 (2010). https://doi.org/10.1038/4641133a
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DOI: https://doi.org/10.1038/4641133a
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