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A measurement using a one-electron quantum cyclotron gives the electron magnetic moment in Bohr magnetons, g/2=1. 001 159 652 180 73 (28) 0. 28 ppt, with an uncertainty 2. 7 and 15 times smaller than for previous measurements in 2006 and 1987. The electron is used as a magnetometer to allow line shape statistics to accumulate, and its spontaneous emission rate determines the correction for its interaction with a cylindrical trap cavity. The new measurement and QED theory determine the fine structure constant, with alpha-1=137. 035 999 084 (51) 0. 37 ppb, and an uncertainty 20 times smaller than for any independent determination of alpha.
Hanneke et al. (Wed,) studied this question.
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