[10p-A11-1~12] 4.3 Laser sources and Laser applications

3:15 PM - 3:30 PM JST(6:15 AM - 6:30 AM UTC)English Presentation

[10p-A11-5] Development and improvement of the triple-band stabilization method for single-photon interference in quantum communication

〇Akito Ozawa¹, Yohei Sugiyama¹, Tsubasa Kashimura¹, Kouya Takehi¹, Ryo Terui¹, Wataru Kokuyama³, Kanta Asakawa¹, Daisuke Akamatsu¹, Feng-Lei Hong^1,2 (1.Dep. Phys. YNU., 2.IMS YNU., 3.AIST.)

Keywords:

fiber interferometer,phase stabilization,quantum communication

High-precision phase stabilization is crucial for single-photon interference in long-distance quantum communication. To address the dispersion issues and system complexity of conventional Dual-band stabilization (DBS), we previously developed a comb-free Triple-band stabilization (TBS) method using a single nonlinear crystal. In this study, we further enhance TBS by positioning the quantum channel at the center of the three bands with a 200 GHz spacing, successfully minimizing spontaneous Raman scattering crosstalk by leveraging its local minimums. Additionally, we introduce a whispering-gallery-mode (WGM) cavity optical-feedbacked laser into the quantum channel to suppress phase noise at high Fourier frequencies. This improved system is expected to significantly increase single-photon interference visibility, thereby benefiting long-distance quantum key and entanglement distributions.