We experimentally and theoretically analyze the transmission of continuous-wave and pulsed squeezed vacuum through rubidium vapor under the conditions of electromagnetically induced transparency. Frequency- and time-domain homodyne tomography is used to measure the quadrature noise and reconstruct the quantum states of the transmitted light. A simple theoretical model explains the spectrum and degradation of the transmitted squeezing with high precision.
@article{arxiv.0804.2703,
title = {Propagation of Squeezed Vacuum under Electromagnetically Induced Transparency},
author = {Eden Figueroa and Mirko Lobino and Dmitry Korystov and Juergen Appel and A. I. Lvovsky},
journal= {arXiv preprint arXiv:0804.2703},
year = {2009}
}