We experimentally demonstrate a quantum communication protocol that enables frequency conversion and routing of quantum optical information in an adiabatic and thus robust way. The protocol is based on electromagnetically-induced transparency in systems with multiple excited levels: transfer and/or distribution of optical states between different signal modes is implemented by adiabatically changing the control fields. The proof-of-principle experiment is performed using the hyperfine levels of the rubidium D1 line.
@article{arxiv.quant-ph/0611181,
title = {Adiabatic frequency conversion of quantum optical information in atomic vapor},
author = {Frank Vewinger and Juergen Appel and Eden Figueroa and A. I. Lvovsky},
journal= {arXiv preprint arXiv:quant-ph/0611181},
year = {2009}
}