Spontaneous Parametric Down‐Conversion in 4H‐SiC Integrated Platform

Spontaneous Parametric Down‐Conversion in 4H‐SiC Integrated Platform

Laser & Photonics Reviews

10.1002/lpor.202500104

https://doi.org/10.1002/lpor.202500104

Xiaodong Shi, Angela Anna Baiju, Veerendra Dhyani, Sihao Wang, Sakthi Sanjeev Mohanraj, Victor Leong, Jiapeng Sun, Boyang Deng, Jingjing Zhang, Yongsheng Wang, Karsten Rottwitt, Haiyan Ou, Di Zhu

01 May 2025

Shi, X., Baiju, A. A., Dhyani, V., Wang, S., Mohanraj, S. S., Leong, V., Sun, J., Deng, B., Zhang, J., Wang, Y., Rottwitt, K., Ou, H., & Zhu, D. (2025). Spontaneous Parametric Down‐Conversion in 4H‐SiC Integrated Platform. Laser & Photonics Reviews. Portico. https://doi.org/10.1002/lpor.202500104

4H‐silicon carbide (SiC) has recently emerged as a promising material for nonlinear photonic integrated circuits, thanks to its low loss, wide bandgap, as well as strong second‐order and third‐order nonlinearities. Though its unique crystal structure allows versatile processes, spontaneous parametric down‐conversion (SPDC) still remains unrealized. In this work, photon‐pair generation in a 4H‐SiC‐on‐insulator integrated platform is demonstrated through modal‐phase‐matched type‐I SPDC. Furthermore, type‐0 and type‐II nonlinear interactions are shown in 4H‐SiC waveguides, thus highlighting the potential to exploit diverse phase‐matching mechanisms on this platform. These results underscore the potential of 4H‐SiC for advancing the development of integrated quantum photonics in the realms of quantum information processing and quantum communication.

Attribution-NonCommercial 4.0 International (CC BY-NC 4.0)

This research / project is supported by the National Research Foundation - Quantum Engineering Programme
Grant Reference no. : NRF2022-QEP2-01-P07

This research / project is supported by the National Research Foundation - National Research Foundation Fellowships
Grant Reference no. : NRF-NRFF15-2023-0005

This research / project is supported by the Agency for Science, Technology and Research - Delta Q
Grant Reference no. : C230917005

This research / project is supported by the Agency for Science, Technology and Research - Young Individual Research Grant
Grant Reference no. : M23M7c0125

This research / project is supported by the Villum Fonden - Villum Experiments
Grant Reference no. : VIL50293

© 2025 The Author(s). Laser & Photonics Reviews published by Wiley-VCH GmbH. This is an open access article under the terms of the Creative Commons Attribution-NonCommercial License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes.

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https://doi.org/10.1002/lpor.202500104