  Cavity-enhanced single quantum dots (QDs) are the main approach towards
ultra-high-performance solid-state quantum light sources for scalable photonic
quantum technologies. Nevertheless, harnessing the Purcell effect requires
precise spectral and spatial alignment of the QDs' emission with the cavity
mode, which is challenging for most cavities. Here we have successfully
integrated miniaturized Fabry-Perot microcavities with a piezoelectric
actuator, and demonstrated a bright single photon source derived from a
deterministically coupled QD within this microcavity. Leveraging the
cavity-membrane structures, we have achieved large spectral-tunability via
strain tuning. On resonance, we have obtained a high Purcell factor of
approximately 9. The source delivers single photons with simultaneous high
extraction efficiency of 0.58, high purity of 0.956(2) and high
indistinguishability of 0.922(4). Together with a small footprint, our scheme
facilitates the scalable integration of indistinguishable quantum light sources
on-chip, and therefore removes a major barrier to the solid-state quantum
information platforms based on QDs.
