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arXiv · 2509.11704

Heralded Emission Detection in InAs/ZnSe Quantum Dot Solids Using Time-Correlated Photons

Chieh Tsao·Xiang Li·Alex Hinkle·Yifan Chen·Elvar Oskarsson·Uri Banin·Hendrik Utzat
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Abstract

Harnessing quantum correlations between photons is an emerging frontier in optical spectroscopy, yet experimental demonstrations have largely remained limited to molecular systems at room temperature. Here, we investigate heralded emission detection (HED) under continuous-wave entangled-photon excitation of near-infrared (NIR)-emitting colloidal III-V quantum dot (QD) solids at low temperatures. We demonstrate the advantages of superconducting nanowire single-photon detectors (SNSPDs) for high time resolution ($\sim$72 ps) and large-area NIR avalanche photodiodes (APDs) for high emission count rates ($\sim$2000 cps). Second-order photon-correlation analysis reveals exciton lifetimes and fine-structure energy splittings. These results establish NIR colloidal QDs as a bright, tunable model system for quantum-light spectroscopy and highlight their compatibility with optical cavities as a further experimental control parameter.

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Chieh Tsao, Xiang Li, Alex Hinkle, Yifan Chen, Elvar Oskarsson, Uri Banin, Hendrik Utzat. 2025-09-15. Heralded Emission Detection in InAs/ZnSe Quantum Dot Solids Using Time-Correlated Photons. https://arxiv.org/abs/2509.11704

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