We present a new derivation of the unpolarized quantum states of light, whose general form was first derived by Prakash and Chandra [Phys. Rev. A 4, 796 (1971)]. Our derivation makes use of some basic group theory, is straightforward, and offers some new insights.
Cite
@article{arxiv.quant-ph/0007099,
title = {Unpolarized light in quantum optics},
author = {Jonas Soderholm and Gunnar Bjork and Alexei Trifonov},
journal= {arXiv preprint arXiv:quant-ph/0007099},
year = {2007}
}