  Applying high power continuous-wave resonant s-shell excitation to a single
self-assembled In- GaAs quantum dot, we demonstrate the generation of
post-selected single-indistinguishable photons from the Mollow triplet
sidebands. A sophisticated spatial filtering technique based on a double
Michelson interferometer enabled us to separate the spectrally close lying
individual Mollow components and perform almost background free two-photon
interference measurements. Showing high consistency with the results of an
independent determination of the emission coherence of 250 +/- 30 ps, our
analysis reveals a close to ideal visibility contrast of up to 97 %. Due to
their easy spectral tunability and their distinct advantage of cascaded photon
emission between the individual Mollow sidebands, they resemble a versatile
tool for quantum information applications.
