  The integration of on-demand single photon sources in photonic circuits is a
major prerequisite for on-chip quantum applications. Among the various
high-quality sources, nanowire quantum dots can be efficiently coupled to
optical waveguides because of their preferred emission direction along their
growth direction. However, local tuning of the emission properties remains
challenging. In this work, we transfer a nanowire quantum dot on a bulk lithium
niobate substrate and show that its emission can be dynamically tuned by
acousto-optical coupling with surface acoustic waves. The purity of the single
photon source is preserved during the strain modulation. We further demonstrate
that the transduction is maintained even with a SiO2 encapsulation layer
deposited on top of the nanowire acting as the cladding of a photonic circuit.
Based on these experimental findings and numerical simulations, we introduce a
device architecture consisting of a nanowire quantum dot efficiently coupled to
a thin film lithium niobate rib waveguide and strain-tunable by surface
acoustic waves.
