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

arXiv · （2025）

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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 ∼28 %. 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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【要点】：本研究实现了在电信O波段的高纯度、不可区分的单光子生成，证明了纳米线量子点是用于光量子通信应用的理想光源。

【方法】：研究利用InAsP/InP纳米线量子点，在上述波段激发下测量了单光子的纯度，并通过Hong-Ou-Mandel实验评估了两光子干涉下的光子不可区分性。

【实验】：在实验中，通过测量得到了g^2(0)=0.006(3)的单光子纯度，并在100 ps时间窗口后选择下实现了94.6%的光子不可区分性，在没有时间选择的情况下为5.58%。此外，实验中测量了约28%的第一透镜光源效率。数据集来源于实验的直接测量结果。

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