  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.
