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

10:15 AM - 10:30 AM JST(1:15 AM - 1:30 AM UTC)Presentation by Applicant for JSAP Young Scientists Presentation Award

[15a-K309-4] 25-GHz-repetition pulse Homodyne measurement using waveguide parametric amplifiers I

〇(B)Yoshitsugu Hoshino¹, Kazuma Takahashi¹, Tatsuki Sonoyama¹, Takumi Suzuki¹, Hirotaka Kashiwazaki², Asuka Inoue², Takeshi Umeki², Warit Asavanant^1,3,4, Mamoru Endo^1,3,4, Akira Furusawa^1,3,4 (1.The Univ. of Tokyo, 2.NTT Device Technology Labs, 3.RIKEN RQC, 4.OptQC)

Keywords:

Quantum Computers,Homodyne Measurement,Wave-Guide Parametric Amplifiers

High-speed homodyne detection is crucial in continuous-variable quantum information processing. However, conventional techniques face limitations in pulse repetition rates due to the constraints of homodyne detectors, typically capped at 100 MHz. This study introduces a novel method using waveguide-based optical parametric amplifiers (OPA) to amplify quantum light before homodyne detection. Using this techniques, the amplified quantum light becomes more tolerant to losses associated with low quantum efficiency in high-speed detectors. This approach enables the use of detectors with significantly higher repetition rates, potentially achieving up to 25 GHz, a substantial improvement over traditional methods. The proposed setup's performance is evaluated using coherent states, with 25 GHz pulse light. This presentation will discuss the experimental results, demonstrating the feasibility and advantages of this method for high-speed quantum information processing.