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By starting with the Maxwell theory of electromagnetism, we study the changeof polarization state of light transmitting through optically anisotropicmedia. The basic idea is to reduce the Maxwell equation to the Schroedingerlike equation for two levels (or states) representing polarization. By usingthe quantum mechanical technique, the density matrix, and path integral, theevolution of the Stokes parameters results in the equation of motion for apseudospin representing a point on the Poincare sphere. Two typical examplesrelevant to actual experiments are considered; the one gives the generalizedFaraday effect, and the other realizes an optical analog of magnetic resonance.Comment: 5 pages, 2 EPS figures, uses REVTeX and epsfig.st

Maxwell-Schrödinger Equation for Polarized Light and Evolution of the Stokes Parameters