High-precision measurement of 2 e/h that uses cryogenic electronic components

Abstract
A new determination of 2e/h is described, in which not only the Josephson junction but also the current-null detector and 100:1 ratio voltage divider are operated at 4.2 K. The results obtained with this new system are compared with previous data obtained with room-temperature components, and the agreement is found to be 0.02 (±0.05) parts in 106.

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