  Quantum technology is playing an increasingly important role due to the
intrinsic parallel processing capabilities endorsed by quantum superposition,
exceeding upper limits of classical performances in diverse fields. Integrated
photonic chip offers an elegant way to construct large-scale quantum systems in
a physically scalable fashion, however, nonuniformity of quantum sources
prevents all the elements from being connected coherently for exponentially
increasing Hilbert space. Here, we experimentally demonstrate 128 identical
quantum sources integrated on a single silica chip. By actively controlling the
light-matter interaction in femtosecond laser direct writing, we are able to
unify the properties of waveguides comprehensively and therefore the
spontaneous four-wave mixing process for quantum sources. We verify the
indistinguishability of the on-chip sources by a series of heralded two-source
Hong-Ou-Mandel interference, with all the dip visibilities above 90%. In
addition, the brightness of the sources is found easily reaching MHz and being
applicable to both discrete-variable and continuous-variable platform, showing
either clear anti-bunching feature or large squeezing parameter under different
pumping regimes. The demonstrated scalability and uniformity of quantum
sources, together with integrated photonic network and detection, will enable
large-scale all-on-chip quantum processors for real-life applications.
