Geodesic
Quantum beats of light polarization and condition of complete positivity
Teoretičeskaâ i matematičeskaâ fizika, Tome 87 (1991) no. 1, pp. 34-39 
A. Yu. Artem'ev. Quantum beats of light polarization and condition of complete positivity. Teoretičeskaâ i matematičeskaâ fizika, Tome 87 (1991) no. 1, pp. 34-39. http://geodesic.mathdoc.fr/item/TMF_1991_87_1_a2/
@article{TMF_1991_87_1_a2,
     author = {A. Yu. Artem'ev},
     title = {Quantum beats of light polarization and condition of complete positivity},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {34--39},
     year = {1991},
     volume = {87},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1991_87_1_a2/}
}
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Voir la notice de l'article provenant de la source Math-Net.Ru

An open spin system with spin $J=1$ interacting with an axisymmetric environment is considered. It is shown that if the symmetry group of the environment is $SO(2)$ or $SO(2)\times\mathbb Z_2^c$ then quantum beats of the polarization of the radiated light are possible. If the symmetry group of the environment is one of the groups $O(2)$, $O(2)^-$, $O(2)\times\mathbb Z_2^c$ then quantum polarization beats are not realized.