Using Electromagnetically Induced Transparency (EIT) in a Cesium vapor, we demonstrate experimentally that the quantum state of a light beam can be mapped into the long lived Zeeman coherences of an atomic ground state. Two non-commuting variables carried by light are simultaneously stored and subsequentely read-out, with no noise added. We compare the case where a tunable single sideband is stored independently of the other one to the case where the two symmetrical sidebands are stored using the same EIT transparency window.
@article{arxiv.0711.0264,
title = {Reversible Quantum Interface for Tunable Single-sideband Modulation},
author = {J. Cviklinski and J. Ortalo and J. Laurat and A. Bramati and M. Pinard and E. Giacobino},
journal= {arXiv preprint arXiv:0711.0264},
year = {2009}
}