  Solid state quantum emitters are a mainstay of quantum nanophotonics as
integrated single photon sources (SPS) and optical nanoprobes. Integrating such
emitters with active nanophotonic elements is desirable in order to attain
efficient control of their optical properties but typically degrades the
photostability of the emitter itself. Here, we demonstrate a tuneable hybrid
device that integrates lifetime-limited single emitters (linewidth : 40 MHz)
and 2D materials at sub-wavelength separation without degradation of the
emission properties. Our device s nanoscale dimensions enable ultra-broadband
tuning (tuning range larger than 400 GHz) and fast modulation (frequency : 100
MHz) of the emission energy, which renders it an integrated, ultra-compact
tuneable SPS. Conversely, this offers a novel approach to optical sensing of 2D
material properties using a single emitter as a nanoprobe.
