The Josephson effect is a macroscopic manifestation of quantum mechanics usually seen in superconductors. Observation of this effect in a gas of ultracold atoms demonstrates the underlying unity of solid and gaseous systems.
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Sackett, C. Cold meeting at a junction. Nature 449, 547–549 (2007). https://doi.org/10.1038/449546a
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DOI: https://doi.org/10.1038/449546a
