Efficient photon-pair emission from a nanostructured resonator and its theoretical description
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arXiv
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| Main Authors: | , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2026
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| _version_ | 1866916008359362560 |
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| author | Poloczek, Michael Paniate, Alberto Zilli, Attilio Sultanov, Vitaliy Luan, Yigong Santiago-Cruz, Tomàs Carletti, Luca Finazzi, Marco Genovese, Marco Ruo-Berchera, Ivano Ferrera, Marzia Toma, Andrea Monticone, Francesco Celebrano, Michele Chekhova, Maria |
| author_facet | Poloczek, Michael Paniate, Alberto Zilli, Attilio Sultanov, Vitaliy Luan, Yigong Santiago-Cruz, Tomàs Carletti, Luca Finazzi, Marco Genovese, Marco Ruo-Berchera, Ivano Ferrera, Marzia Toma, Andrea Monticone, Francesco Celebrano, Michele Chekhova, Maria |
| contents | Spontaneous parametric down-conversion (SPDC) in subwavelength nanostructures is a promising source of quantum light, owing to its multifunctionality and ability to generate complex quantum states. Nevertheless, the mechanisms governing photon-pair generation in such systems remain only partially understood. In particular, experimental investigations of key emission properties in individual resonators, such as directionality and spectral distribution, are still lacking, and predictive theoretical frameworks have not yet been experimentally validated. Here, we report the first measurement of the directional and spectral distributions of photon pairs generated via SPDC in a nanostructured resonator. Both distributions exhibit resonant behaviour, which we describe using an extended quasi-normal-mode theory. This comparison is enabled by photon-pair count rates of up to 0.45 Hz/mW -- to our knowledge, the highest reported for a nanostructured resonator. Our results provide new physical insight into nanoscale SPDC and represent an important step toward designing of efficient miniaturized quantum light sources. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_24351 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Efficient photon-pair emission from a nanostructured resonator and its theoretical description Poloczek, Michael Paniate, Alberto Zilli, Attilio Sultanov, Vitaliy Luan, Yigong Santiago-Cruz, Tomàs Carletti, Luca Finazzi, Marco Genovese, Marco Ruo-Berchera, Ivano Ferrera, Marzia Toma, Andrea Monticone, Francesco Celebrano, Michele Chekhova, Maria Quantum Physics Optics Spontaneous parametric down-conversion (SPDC) in subwavelength nanostructures is a promising source of quantum light, owing to its multifunctionality and ability to generate complex quantum states. Nevertheless, the mechanisms governing photon-pair generation in such systems remain only partially understood. In particular, experimental investigations of key emission properties in individual resonators, such as directionality and spectral distribution, are still lacking, and predictive theoretical frameworks have not yet been experimentally validated. Here, we report the first measurement of the directional and spectral distributions of photon pairs generated via SPDC in a nanostructured resonator. Both distributions exhibit resonant behaviour, which we describe using an extended quasi-normal-mode theory. This comparison is enabled by photon-pair count rates of up to 0.45 Hz/mW -- to our knowledge, the highest reported for a nanostructured resonator. Our results provide new physical insight into nanoscale SPDC and represent an important step toward designing of efficient miniaturized quantum light sources. |
| title | Efficient photon-pair emission from a nanostructured resonator and its theoretical description |
| topic | Quantum Physics Optics |
| url | https://arxiv.org/abs/2603.24351 |