Superconducting quantum circuits are the core technology behind the most sensitive magnetometers. An analogous device has now been implemented using a gas of ultracold atoms, with possible applications for rotation sensing.
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Sackett, C. An atomic SQUID. Nature 505, 166–167 (2014). https://doi.org/10.1038/nature12846
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DOI: https://doi.org/10.1038/nature12846
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