%0 Journal Article
%T Magic frequencies in atom-light interaction for precision probing of the density matrix
%A Menachem Givon
%A Yair Margalit
%A Amir Waxman
%A Tal David
%A David Groswasser
%A Yonathan Japha
%A Ron Folman
%J Physics
%D 2013
%I arXiv
%R 10.1103/PhysRevLett.111.053004
%X We analyze theoretically and experimentally the existence of a {\it magic frequency} for which the absorption of a linearly polarized light beam by vapor alkali atoms is independent of the population distribution among the Zeeman sub-levels and the angle between the beam and a magnetic field. The phenomenon originates from a peculiar cancelation of the contributions of higher moments of the atomic density matrix, and is described using the Wigner-Eckart theorem and inherent properties of Clebsch-Gordan coefficients. One important application is the robust measurement of the hyperfine population.
%U http://arxiv.org/abs/1306.1151v1