Progress on accurate measurement of the Planck constant: watt balance and counting atoms
arXiv:1409.7597 · doi:10.1088/1674-1056/24/1/010601
Abstract
The Planck constant is one of the most significant constants in quantum physics. Recently, the precision measurement of the numeral value of has been a hot issue due to its important role in establishment for both a new SI and a revised fundamental physical constant system. Up to date, two approaches, the watt balance and counting atoms, have been employed to determine the Planck constant at a level of several parts in . In this paper, the principle and progress on precision measurement of the Planck constant using watt balance and counting atoms at national metrology institutes are reviewed. Further improvements for the Planck constant determination and possible developments of a revised physical constant system in future are discussed.
arXiv comment24 pages, 15 figures, accepted for publication in Chinese Physics B
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