[15a-K309-1~8] 3.9 Optical quantum physics and technologies

9:30 AM - 9:45 AM JST(12:30 AM - 12:45 AM UTC)Presentation by Applicant for JSAP Young Scientists Presentation Award

[15a-K309-1] Beam diameter optimization for femtosecond sum-frequency generation in single-photon detection

〇Yuta Kochi^1,2, Maximilian Hornauer^1,2, Sunao Kurimura³, Junko Ishi-Hayase^1,2 (1.Keio Univ., 2.Keio CSRN, 3.NIMS)

Keywords:

nonlinear optics,femtosecond regime,quantum communication

In recent quantum communication research, multimodal and broadband capabilities have become critical challenges. Our group has previously developed a frequency up-conversion single-photon detector, achieving a time resolution of 412 fs. However, the optimization of beam diameters within the crystal has been insufficient, and theoretical analysis on this topic has remained unexplored. In this study, we theoretically identified the optimal combination of beam diameters for femtosecond SFG and conducted experimental validation to demonstrate its effectiveness.