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arXiv · 2503.12116

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

Mohammed K. Alqedra·Chiao-Tzu Huang·Wen-Hao Chang·Sofiane Haffouz·Philip J. Poole·Dan Dalacu·Ali W. Elshaari·Val Zwiller
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Abstract

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 $94.6\,\%$ with a temporal postselection of 100 ps time window and $5.58\,\%$ without temporal postselection. We measure a first-lens source efficiency of $\sim28\,\%$. 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.

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Mohammed K. Alqedra, Chiao-Tzu Huang, Wen-Hao Chang, Sofiane Haffouz, Philip J. Poole, Dan Dalacu, Ali W. Elshaari, Val Zwiller. 2025-03-15. Indistinguishable Single Photons from Nanowire Quantum Dots in the Telecom O-Band. https://doi.org/10.1063/5.0271146

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