[17p-S4_203-1~12] 3.9 Optical quantum physics and technologies

2:45 PM - 3:00 PM JST(5:45 AM - 6:00 AM UTC)Presentation by Applicant for JSAP Young Scientists Presentation Award

[17p-S4_203-4] Research on the generation of high-level squeezed light from a waveguide optical parametric amplifier by improving detection efficiency with a spatial light modulator

〇(M1)Gyeongmin Ha¹, Kazuki Hirota¹, Takahiro Kashiwazaki², Taichi Yamashima², Takumi Suzuki¹, Kazuma Takahashi¹, Akito Kawasaki^3,4, Asuka Inoue², Warit Asavanant^3,4, Mamoru Endo^1,3, Takeshi Umeki², Akira Furusawa^1,3,4 (1.The Univ. of Tokyo, 2.NTT Device Technology Labs, 3.RIKEN RQC, 4.OptQC)

Keywords:

optical quantum computer,squeezed vacuum state

Broadband squeezed light is indispensable for optical quantum computing. In this study, we addressed the degradation of the squeezing level observed in previous work utilizing a periodically poled lithium niobate (PPLN) waveguide-based optical parametric amplifier (OPA), focusing on the spatial mode mismatch with the local oscillator (LO) beam. By incorporating a spatial light modulator (SLM) into the LO path and optimizing the phase mask using the squeezing level as a cost function, we successfully improved the mode matching. Consequently, the detection efficiency was enhanced, yielding a squeezing level of 10.6±0.2 dB, which surpasses our previous record. This approach demonstrates the simultaneous achievement of terahertz-order bandwidth and high squeezing levels.