Two superconductors connected by a weak link form a Josephson junction, a nonlinear circuit element at the heart of many quantum devices. Quantized electrical current steps that were predicted decades ago have now been observed experimentally.
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Rastelli, G., Pop, I.M. Steps towards current metrology. Nat. Phys. 19, 771–772 (2023). https://doi.org/10.1038/s41567-023-01976-x
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DOI: https://doi.org/10.1038/s41567-023-01976-x
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