High-purity frequency-degenerate photon pair generation via cascaded SFG/SPDC in thin film lithium niobate
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arXiv
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| Main Authors: | , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866914201796083712 |
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| author | Hefti, Olivia Clementi, Marco Melani, Enrico Tremblay, Jean-Etienne Volpini, Andrea Koyaz, Yesim Zarebidaki, Homa Prieto, Ivan Dubochet, Olivier Bajoni, Daniele Caër, Charles Sattari, Hamed Brès, Camille-Sophie Galli, Matteo Grassani, Davide |
| author_facet | Hefti, Olivia Clementi, Marco Melani, Enrico Tremblay, Jean-Etienne Volpini, Andrea Koyaz, Yesim Zarebidaki, Homa Prieto, Ivan Dubochet, Olivier Bajoni, Daniele Caër, Charles Sattari, Hamed Brès, Camille-Sophie Galli, Matteo Grassani, Davide |
| contents | Frequency-degenerate photon pairs generated using nonlinear photonic integrated devices are a crucial resource for scalable quantum information processing and metrology. However, their realization is hindered by unwanted parametric processes occurring within the same phase matching band, which degrade the signal-to-noise ratio and reduce the purity of the associated quantum states. Here, we propose a dual-pump scheme to produce frequency-degenerate photon pairs, based on cascaded sum-frequency generation and spontaneous parametric down-conversion occurring within a single waveguide, while strongly suppressing parasitic photon pair generation from single-pump processes. This approach significantly simplifies the design compared to microresonator-based methods and enables both pumping and collection of photon pairs entirely in the telecom band. We experimentally validate the concept in a layer-poled thin film lithium niobate waveguide, achieving frequency-degenerate photon pair generation with a brightness of \SI{1.0(3)e5}{\hertz \per \nm \per \square \milli \watt } and a 40 dB suppression of unwanted single-pump processes. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2512_13248 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | High-purity frequency-degenerate photon pair generation via cascaded SFG/SPDC in thin film lithium niobate Hefti, Olivia Clementi, Marco Melani, Enrico Tremblay, Jean-Etienne Volpini, Andrea Koyaz, Yesim Zarebidaki, Homa Prieto, Ivan Dubochet, Olivier Bajoni, Daniele Caër, Charles Sattari, Hamed Brès, Camille-Sophie Galli, Matteo Grassani, Davide Quantum Physics Optics Frequency-degenerate photon pairs generated using nonlinear photonic integrated devices are a crucial resource for scalable quantum information processing and metrology. However, their realization is hindered by unwanted parametric processes occurring within the same phase matching band, which degrade the signal-to-noise ratio and reduce the purity of the associated quantum states. Here, we propose a dual-pump scheme to produce frequency-degenerate photon pairs, based on cascaded sum-frequency generation and spontaneous parametric down-conversion occurring within a single waveguide, while strongly suppressing parasitic photon pair generation from single-pump processes. This approach significantly simplifies the design compared to microresonator-based methods and enables both pumping and collection of photon pairs entirely in the telecom band. We experimentally validate the concept in a layer-poled thin film lithium niobate waveguide, achieving frequency-degenerate photon pair generation with a brightness of \SI{1.0(3)e5}{\hertz \per \nm \per \square \milli \watt } and a 40 dB suppression of unwanted single-pump processes. |
| title | High-purity frequency-degenerate photon pair generation via cascaded SFG/SPDC in thin film lithium niobate |
| topic | Quantum Physics Optics |
| url | https://arxiv.org/abs/2512.13248 |