Broadband High-Level Squeezed Light using Waveguide Optical Parametric Amplifiers with External Dispersion Compensation

@misc{suzuki2026broadband,
  title = {{Broadband High-Level Squeezed Light using Waveguide Optical Parametric Amplifiers with External Dispersion Compensation}},
  author = {Takumi Suzuki and Shotaro Oki and Kazuki Hirota and Takaya Hoshi and Ryuhoh Ide and Takahiro Kashiwazaki and Taichi Yamashima and Asuka Inoue and Takeshi Umeki and Mamoru Endo and Akira Furusawa},
  howpublished = {arXiv},
  year = {2026},
  month = jun,
  doi = {10.48550/arxiv.2606.17422},
  eprint = {2606.17422},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2606.17422},
  note = {CC BY 4.0},
}

TY  - UNPB
TI  - Broadband High-Level Squeezed Light using Waveguide Optical Parametric Amplifiers with External Dispersion Compensation
AU  - Takumi Suzuki
AU  - Shotaro Oki
AU  - Kazuki Hirota
AU  - Takaya Hoshi
AU  - Ryuhoh Ide
AU  - Takahiro Kashiwazaki
AU  - Taichi Yamashima
AU  - Asuka Inoue
AU  - Takeshi Umeki
AU  - Mamoru Endo
AU  - Akira Furusawa
PY  - 2026
DA  - 2026/06/16
PB  - arXiv
DO  - 10.48550/arxiv.2606.17422
UR  - https://arxiv.org/abs/2606.17422
AB  - We demonstrate broadband phase-sensitive amplification (PSA) measurement of squeezed light generated by a waveguide optical parametric amplifier (OPA) with external dispersion compensation. In broadband systems, group velocity dispersion (GVD) induces a frequency-dependent rotation of the squeezing axis, which limits the observable bandwidth in PSA measurements. To overcome this limitation, we introduce external dispersion compensation between two OPAs and suppress the quadrature rotation over a wide frequency range. As a result, we observe a maximum squeezing of 5.9 dB near the carrier frequency and more than 5 dB of squeezing up to a frequency offset of 4.5 THz from the carrier. Furthermore, squeezing below the shot-noise level is confirmed up to a frequency offset of 6 THz from the carrier, corresponding to the accessible phase-matching bandwidth of the waveguide OPA. Our results establish a practical method for broadband characterization of squeezed light and provide a key step toward ultrafast continuous-variable quantum information processing.
ER  -