  In this paper we show that the frequencies of propagating electromagnetic
wave (photon) in rotating dielectric medium obey Landau quantization. We show
that the degeneracy of right and left helicities of photons is broken on the
lowest Landau level. In homogeneous space this level is shown to be helical,
i.e. left and right helical photons counter-propagate. This leads to helical
vortical effect for photons.
