  Recently demonstrated solid state single electron sources generate different
quantum states depending on their operation condition. For adiabatic and
non-adiabatic sources we determine the Glauber correlation function in terms of
the Floquet scattering matrix of the source. The correlation function provides
full information on the shape of the state, on its time-dependent amplitude and
phase, which makes the coherence properties of single electron states essential
for the production of quantum multi-particle states.
