  Quantum networks require flying qubits that transfer information between the
nodes. This may be implemented by means of single atoms (the nodes) that emit
and absorb single photons (the flying qubits) and requires full control of
photon absorption and emission by the individual emitters. In this work, we
theoretically characterize the wave packet of a photon emitted by a single atom
undergoing a spontaneous Raman transition in a three-level scheme. We
investigate several excitation schemes that are experimentally relevant and
discuss control parameters that allow one to tailor the spectrum of the emitted
photon wave packet.
