  Scaling-up optical quantum technologies requires to combine highly efficient
multi-photon sources and integrated waveguide components. Here, we interface
these scalable platforms: a quantum dot based multi-photon source and a
reconfigurable photonic chip on glass are combined to demonstrate high-rate
three-photon interference. The temporal train of single-photons obtained from a
quantum emitter is actively demultiplexed to generate a 3.8 kHz three-photon
source, which is then sent to the input of a tuneable tritter circuit,
demonstrating the on-chip quantum interference of three indistinguishable
single-photons. Pseudo number-resolving photon detection characterising the
output distribution shows that this first combination of scalable sources and
reconfigurable photonic circuits compares favourably in performance with
respect to previous implementations. A detailed loss-budget shows that merging
solid-state based multi-photon sources and reconfigurable photonic chips could
allow ten-photon experiments on chip at ${\sim}40$ Hz rate in a foreseeable
future.
