Heralded Emission Detection in Quantum Dot Solids under Twin-Photon Excitation

• URL: http://arxiv.org/abs/2509.11704v1
• Date: Mon, 15 Sep 2025 09:06:27 GMT
• Title: Heralded Emission Detection in Quantum Dot Solids under Twin-Photon Excitation
• Authors: Chieh Tsao, Xiang Li, Alex Hinkle, Yifan Chen, Elvar Oskarsson, Uri Banin, Hendrik Utzat,
• Abstract summary: We demonstrate heralded emission detection (HED) under continuous-wave entangled-photon excitation of near-infrared (NIR)-emitting colloidal III-V quantum dots (QDs) at low temperatures.<n>To our knowledge, these results represent the first demonstration of HED in the solid state and establish NIR QDs as a bright, tunable model system.
• Score: 7.388865848912435
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Harnessing quantum correlations between photons is an emerging direction in optical spectroscopy, but experimental progress has thus far been limited to fluorescence-detected studies of molecular systems at room temperature. Here, we demonstrate heralded emission detection (HED) under continuous-wave (CW) entangled-photon excitation of near-infrared (NIR)-emitting colloidal III-V quantum dots (QDs) at low temperatures. We use superconducting nanowire single-photon detectors (SNSPDs) and large-area NIR avalanche photodiodes (APDs) to maximize the time resolution ($\sim$70 ps) and emission count rates ($\sim$2000 cps). To our knowledge, these results represent the first demonstration of HED in the solid state and establish NIR QDs as a bright, tunable model system with longer-lived coherences and integrability with optical cavities as an additional experimental control knob.

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