Hybrid biphoton spectrometer for time-resolved quantum spectroscopy across visible and near-infrared regions

• URL: http://arxiv.org/abs/2510.01836v2
• Date: Mon, 03 Nov 2025 12:18:48 GMT
• Title: Hybrid biphoton spectrometer for time-resolved quantum spectroscopy across visible and near-infrared regions
• Authors: Ozora Iso, Koya Onoda, Nicola J. Fairbairn, Masahiro Yabuno, Hirotaka Terai, Shigehito Miki, Ryosuke Shimizu,
• Abstract summary: We introduce a novel methodology for capturing a biphoton spectrum that comprises visible and near-infrared photons.<n>We successfully measure the joint spectral intensity by leveraging a time-tagging acquisition strategy.<n>This methodology bridges the gap between the requirements for pure biphoton states and the need for dynamic insights in quantum spectroscopy.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Joint spectral measurements are a powerful tool for characterising biphoton spectral correlation, which is crucial for quantum information and communication technologies. In these applications, highly pure biphoton states are essential in any time- and frequency-mode, often obviating the need for time-resolved measurements. Conversely, spectroscopy utilising entangled photon pairs is gaining significant attention for its ability to unveil molecular dynamics, a field that critically demands time-resolved capabilities. Here, we introduce a novel methodology for capturing a biphoton spectrum that comprises visible and near-infrared photons, resulting in a three-fold non-degenerate joint spectrum. Our system employs two non-scanning spectrographs: a fibre spectrograph for near-infrared photons and a delay-line-anode single-photon imager for visible photons. We successfully measure the joint spectral intensity by leveraging a time-tagging acquisition strategy. Furthermore, our approach uniquely enables time-resolved joint spectral measurements with a temporal resolution of approximately 150 ps. This methodology bridges the gap between the requirements for pure biphoton states and the need for dynamic insights in quantum spectroscopy.

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