When electric currents are made sufficiently small, the electrons can be seen moving one by one. This is accomplished in a microelectronic circuit, providing a means of obtaining an accurate standard for current.
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Averin, D. Electrons held in a queue. Nature 434, 285–287 (2005). https://doi.org/10.1038/434285a
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DOI: https://doi.org/10.1038/434285a
