We report the first direct experimental characterization of continuous variable quantum Stokes parameters. We generate a continuous wave light beam with more than 3 dB of simultaneous squeezing in three of the four Stokes parameters. The polarization squeezed beam is produced by mixing two quadrature squeezed beams on a polarizing beam splitter. Depending on the squeezed quadrature of these two beams the quantum uncertainty volume on the Poincar\'{e} sphere became a `cigar' or `pancake'-like ellipsoid.
@article{arxiv.quant-ph/0110129,
title = {Polarization Squeezing of Continuous Variable Stokes Parameters},
author = {Warwick P. Bowen and Roman Schnabel and Hans -A. Bachor and Ping Koy Lam},
journal= {arXiv preprint arXiv:quant-ph/0110129},
year = {2009}
}