@article{2277703c68f144958b3f0b1bb564f9d6,
title = "Measurement of a helium tune-out frequency: an independent test of quantum electrodynamics",
abstract = "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 work, we measure the tune-out frequency for the 2 3S 1 state of helium between transitions to the 2 3P and 3 3P manifolds and compare it with new theoretical QED calculations. The experimentally determined value of 725,736,700(260) megahertz differs from theory [725,736,252(9) megahertz] by 1.7 times the measurement uncertainty and resolves both the QED contributions and retardation corrections.",
author = "Henson, {B. M.} and Ross, {J. A.} and Thomas, {K. F.} and Kuhn, {C. N.} and Shin, {D. K.} and Hodgman, {S. S.} and Yong-Hui Zhang and Li-Yan Tang and Drake, {G. W. F.} and Bondy, {A. T.} and Truscott, {A. G.} and Baldwin, {K. G. H.}",
note = "Funding Information: We thank M. Bromley for instructive discussion regarding the hyperpolarizability, D. Cocks for careful reading of the manuscript, C. J. Vale and S. Hoinka for the loan of the laser, T.-Y. Shi for helpful discussions regarding the theoretical calculations, and K. Pachucki for helpful correspondence concerning the relativistic and retardation corrections to the tune-out frequency. Funding: This work was supported through Australian Research Council (ARC) Discovery Project grants DP160102337 and DP180101093, as well as Linkage Project LE180100142. K.F.T. and D.K.S. were supported by Australian Government Research Training Program (RTP) scholarships. S.S.H. was supported by ARC Discovery Early Career Researcher Award DE150100315. L.-Y.T. was supported by the National Key Research and Development Program of China under grant 2017YFA0304402, the Strategic Priority Research Program of the Chinese Academy of Sciences under grant XDB21030300, and the National Natural Science Foundation of China under grants 12174402 and 12121004. G.W.F.D. acknowledges support by the Natural Sciences and Engineering Research Council of Canada (NSERC) and by SHARCNET. Publisher Copyright: {\textcopyright} 2022 American Association for the Advancement of Science. All rights reserved.",
year = "2022",
month = apr,
day = "8",
doi = "10.1126/science.abk2502",
language = "English",
volume = "376",
pages = "199--203",
journal = "Science",
issn = "1095-9203",
publisher = "American Association for the Advancement of Science (AAAS)",
number = "6589",
}