Indistinguishable Single Photons from Nanowire Quantum Dots in the Telecom O-Band

On-demand single-photon sources operating at telecom wavelengths are crucial for quantum communication and photonic quantum technologies. In this work, we demonstrate high-purity, indistinguishable single-photon generation in the telecom O-band from an InAsP/InP nanowire quantum dot. We measured a single-photon purity of $g^2(0)=0.006(3)$ under aboveband excitation. Furthermore, we characterize two-photon interference via Hong-Ou-Mandel measurements and achieve a photon indistinguishability of $94.6\mathrm{\%}$ with a temporal postselection of 100 ps time window and $5.58\mathrm{\%}$ without temporal postselection. We measure a first-lens source efficiency of $\sim 28\mathrm{\%}$. These results highlight the potential of nanowire quantum dots as a promising source of telecom single photons for photonic quantum applications, offering deterministic positioning, efficient photon extraction, and scalable production.