title: Magic frequencies in atom-light interaction for precision probing of the density matrix.
abstract: We analyze theoretically and experimentally the existence of a magic frequency for which the absorption of a linearly polarized light beam by a vapor of alkali-metal atoms is independent of the population distribution among the Zeeman sublevels and the angle between the beam and a magnetic field. The phenomenon originates from a peculiar cancellation 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.
authors: Ben-Gurion University of the Negev, PO Box 653, Beer Sheva 84105, Israel. givonme@bgu.ac.il
authors: Menachem
authors: M
authors: Givon
authors: Yair
authors: Y
authors: Margalit
authors: Amir
authors: A
authors: Waxman
authors: Tal
authors: T
authors: David
authors: David
authors: D
authors: Groswasser
authors: Yonathan
authors: Y
authors: Japha
authors: Ron
authors: R
authors: Folman