Towards Transform-Limited Single Photons from a Nanowire Quantum Dot

Quantum dots embedded within different photonic structures can generate single photons and entangled photon pairs efficiently and at high emission rates. We present a single photon source based on a quantum dot embedded within a nanowire waveguide fabricated using selective-area vapour-liquid-solid epitaxy. The device generates single photons at a high repetition rate limited by the quantum dot lifetime (τ ~ 1 ns) and with low multi-photon emission probability (g 2 (0) ~ 0). Furthermore, linewidths of the emitted photons approach the Fourier-transform limit when the sources are excited above-band.