Presentation Information
[17p-S4_203-3]Generation and Measurement of Broadband High-Level Squeezed Light Using Waveguide Optical Parametric Amplifiers with External Dispersion Compensation
〇(B)Shotaro Oki1, Takumi Suzuki1, Kazuki Hirota1, Takaya Hoshi1, Takahiro Kashiwazaki2, Taichi Yamashima2, Asuka Inoue2, Takeshi Umeki2, Mamoru Endo1,3, Akira Furusawa1,3,4 (1.The Univ. of Tokyo, 2.NTT Device Technology Labs, 3.RIKEN RQC, 4.OptQC)
Keywords:
optics,quantum information,squeezed light
Broadband squeezed light is essential for high-speed continuous-variable quantum information processing. While waveguide optical parametric amplifiers (OPAs) theoretically support wide bandwidths, group velocity dispersion (GVD) typically limits the measurable squeezing bandwidth to less than 1.5 THz by causing phase rotation.
In this study, we demonstrate the simultaneous measurement of squeezed light across a 5 THz bandwidth using dispersion-compensated Phase Sensitive Amplification (PSA). To minimize loss and effectively compensate for the waveguide dispersion, we adopted a free-space configuration with inserted fused silica. This setup allowed us to align the squeezing phase across the entire band. We successfully observed over 5 dB of squeezing over the full 5 THz phase-matching bandwidth. This achievement overcomes conventional GVD limitations and marks a significant step toward ultra-fast optical quantum computing.
In this study, we demonstrate the simultaneous measurement of squeezed light across a 5 THz bandwidth using dispersion-compensated Phase Sensitive Amplification (PSA). To minimize loss and effectively compensate for the waveguide dispersion, we adopted a free-space configuration with inserted fused silica. This setup allowed us to align the squeezing phase across the entire band. We successfully observed over 5 dB of squeezing over the full 5 THz phase-matching bandwidth. This achievement overcomes conventional GVD limitations and marks a significant step toward ultra-fast optical quantum computing.