  A hybrid system of a semiconductor quantum dot single photon source and a
rubidium quantum memory represents a promising architecture for future photonic
quantum repeaters. One of the key challenges lies in matching the emission
frequency of quantum dots with the transition frequency of rubidium atoms while
preserving the relevant emission properties. Here, we demonstrate the
bidirectional frequency-tuning of the emission from a narrow-linewidth
(close-to-transform-limited) quantum dot. The frequency tuning is based on a
piezoelectric strain-amplification device, which can apply significant stress
to thick bulk samples. The induced strain shifts the emission frequency of the
quantum dot over a total range of $1.15\ \text{THz}$, about three orders of
magnitude larger than its linewidth. Throughout the whole tuning process, both
the spectral properties of the quantum dot and its single-photon emission
characteristics are preserved. Our results show that external stress can be
used as a promising tool for reversible frequency tuning of high-quality
quantum dots and pave the wave towards the realisation of a quantum dot --
rubidium atoms interface for quantum networking.
