Measurement of a helium tune-out frequency: an independent test of quantum electrodynamics

  title={Measurement of a helium tune-out frequency: an independent test of quantum electrodynamics},
  author={Bryce M. Henson and Jacob A. Ross and K. F. Thomas and Carlos C. N. Kuhn and D K Shin and Sean S. Hodgman and Yong-hui Zhang and Li-yan Tang and G. W. F. Drake and Aaron Bondy and Andrew G. Truscott and Kenneth G. H. Baldwin},
  pages={199 - 203}
Despite quantum electrodynamics (QED) being one of the most stringently tested theories underpinning modern physics, recent precision atomic spectroscopy measurements have uncovered several small discrepancies between experiment and theory. One particularly powerful experimental observable that tests QED independently of traditional energy level measurements is the “tune-out” frequency, where the dynamic polarizability vanishes and the atom does not interact with applied laser light. In this… 

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