Graduate students at the Harvard University in the US have developed new methods and apparatus with which to measure the intrinsic magnetism or magnetic moment of the electron. The new measurement method is important for testing quantum electrodynamics (QED) that describes the way light and matter interact through the electromagnetic force. The electron must be bound weakly enough so that its magnetism is not significantly altered by the artificial atom, so that accurate magnetism of the electron can be measured. A technique called quantum-jump spectroscopy is also used to measure the cyclotron frequency. The precise measurement of the electron's magnetism is to determine the fine-structure constant. Confining a single electron within a home-made atom and probing the quantum structure of this artificial atom has allowed to measure the electron's intrinsic magnetism to an accurate level.
ASJC Scopus subject areas
- Physics and Astronomy(all)