Broadband Quantum Photon Source in Step-Chirped Periodically Poled Lithium Niobate Waveguide
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arXiv
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| Format: | Preprint |
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2025
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| _version_ | 1866918154393878528 |
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| author | Fang, Xiao-Xu Shentu, Guoliang Lu, He |
| author_facet | Fang, Xiao-Xu Shentu, Guoliang Lu, He |
| contents | Broadband nonlinear optical devices play a critical role in both classical and quantum optics. Here, we design and fabricate a 6.82-mm-long step-chirped periodically poled lithium niobate~(CPPLN) waveguide on lithium niobate on insulator, which enables quasi-phase matching over a broad bandwidth for second-harmonic generation~(SHG) and spontaneous parametric down-conversion~(SPDC). The SHG achieves an average efficiency of 54.4\%/W/cm$^2$ over the first-harmonic wavelength range of 1510~nm-1620~nm, paving the way for realizing SPDC across a wide range of pump wavelengths. For SPDC, by tuning the pump wavelength to 775~nm, 780~nm, and 785~nm, we achieve broadband photon-pair generation with a maximum full bandwidth and brightness up to 99~THz~(846~nm) and 20~GHz/mW/nm, respectively. Our findings provide an efficient and experiment-friendly approach for generating broadband photon pairs, which holds significant promise for advancing applications in quantum metrology. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2510_03619 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Broadband Quantum Photon Source in Step-Chirped Periodically Poled Lithium Niobate Waveguide Fang, Xiao-Xu Shentu, Guoliang Lu, He Quantum Physics Optics Broadband nonlinear optical devices play a critical role in both classical and quantum optics. Here, we design and fabricate a 6.82-mm-long step-chirped periodically poled lithium niobate~(CPPLN) waveguide on lithium niobate on insulator, which enables quasi-phase matching over a broad bandwidth for second-harmonic generation~(SHG) and spontaneous parametric down-conversion~(SPDC). The SHG achieves an average efficiency of 54.4\%/W/cm$^2$ over the first-harmonic wavelength range of 1510~nm-1620~nm, paving the way for realizing SPDC across a wide range of pump wavelengths. For SPDC, by tuning the pump wavelength to 775~nm, 780~nm, and 785~nm, we achieve broadband photon-pair generation with a maximum full bandwidth and brightness up to 99~THz~(846~nm) and 20~GHz/mW/nm, respectively. Our findings provide an efficient and experiment-friendly approach for generating broadband photon pairs, which holds significant promise for advancing applications in quantum metrology. |
| title | Broadband Quantum Photon Source in Step-Chirped Periodically Poled Lithium Niobate Waveguide |
| topic | Quantum Physics Optics |
| url | https://arxiv.org/abs/2510.03619 |