Although it is over 100 years since Millikan showed that electric charge is quantized, it is only with the development of a new generation of charge pumps that this fact can be used to define the fundamental unit of electrical current, the ampere.
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Delsing, P. Electrons go surfing one by one. Nature Phys 3, 300–301 (2007). https://doi.org/10.1038/nphys612
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DOI: https://doi.org/10.1038/nphys612
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