[18a-S4_203-1~7] 3.9 Optical quantum physics and technologies

9:45 AM - 10:00 AM JST(12:45 AM - 1:00 AM UTC)Presentation by Applicant for JSAP Young Scientists Presentation Award

[18a-S4_203-4] Experimental Demonstration of Twin-Field Quantum Key Distribution using an Acousto-Optic Modulator

〇Tadashi Chiyokura¹, Takuya Hirano¹ (1.Gakushuin Univ.)

Keywords:

quantum key distribution

Twin-Field Quantum Key Distribution (TF-QKD) is attracting attention as it enables long distance key distribution. In an experimental implementation of TF-QKD, a technique for stabilizing the relative phase of the light sent from Alice's and Bob's stations and received at Charlie's station is crucial. In this study, we report the successful stabilization of the relative phase using an acousto-optic modulator, with feedback control performed solely within Charlie’s station. In the experiment, Alice and Bob are connected to Charlie via 50 km of optical fibers, and the relative phase is measured using a balanced detector.