Magic Frequencies in AtomLight 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 alkalimetal 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 WignerEckart theorem and inherent properties of ClebschGordan coefficients. One important application is the robust measurement of the hyperfine population.
 Publication:

Physical Review Letters
 Pub Date:
 August 2013
 DOI:
 10.1103/PhysRevLett.111.053004
 arXiv:
 arXiv:1306.1151
 Bibcode:
 2013PhRvL.111e3004G
 Keywords:

 32.10.Fn;
 32.70.Cs;
 42.25.Bs;
 Fine and hyperfine structure;
 Oscillator strengths lifetimes transition moments;
 Wave propagation transmission and absorption;
 Quantum Physics;
 Physics  Atomic Physics;
 Physics  Optics
 EPrint:
 doi:10.1103/PhysRevLett.111.053004