Broadband Quantum Photon Source in Step-Chirped Periodically Poled Lithium Niobate Waveguide

• URL: http://arxiv.org/abs/2510.03619v1
• Date: Sat, 04 Oct 2025 02:06:00 GMT
• Title: Broadband Quantum Photon Source in Step-Chirped Periodically Poled Lithium Niobate Waveguide
• Authors: Xiao-Xu Fang, Guoliang Shentu, He Lu,
• Abstract summary: We fabricate a 6.82-mm-long step-chirped periodically poled lithium niobate( CPPLN) waveguide on lithium niobate on insulator.<n>We achieve broadband photon-pair generation with a maximum full bandwidth and brightness up to 99THz(846nm) and 20GHz/mW/nm, respectively.
• Score: 0.764671395172401
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: 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.

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