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2020 IPS Conference
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Magic Frequencies in Atom-Light Interaction for Precision Probing of the Density Matrix
Yair Margalit [1] , Menachem Givon [1] , Amir Waxman [1] , Tal David [2] , David Groswasser [1] , Yonathan Japha [1] , Ron Folman [1]
[1] Ben-Gurion University of the Negev
[2] Israel Aerospace Industries, Ramta Division
We analyze theoretically and experimentally the existence of a magic frequency for which the absorption of a linearly polarized light beam by vapor alkali-metal 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.