Continuous-wave 6-dB-squeezed light with 2.5-THz-bandwidth from single-mode PPLN waveguide

DOI DOI PDF 11 Citations 43 References Open Access
  • Takahiro Kashiwazaki
    NTT Device Technology Labs, NTT Corporation 1 , 3-1, Morinosato Wakamiya, Atsugi, Kanagawa 243-0198, Japan
  • Naoto Takanashi
    Department of Applied Physics, School of Engineering, The University of Tokyo 2 , 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
  • Taichi Yamashima
    Department of Applied Physics, School of Engineering, The University of Tokyo 2 , 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
  • Takushi Kazama
    NTT Device Technology Labs, NTT Corporation 1 , 3-1, Morinosato Wakamiya, Atsugi, Kanagawa 243-0198, Japan
  • Koji Enbutsu
    NTT Device Technology Labs, NTT Corporation 1 , 3-1, Morinosato Wakamiya, Atsugi, Kanagawa 243-0198, Japan
  • Ryoichi Kasahara
    NTT Device Technology Labs, NTT Corporation 1 , 3-1, Morinosato Wakamiya, Atsugi, Kanagawa 243-0198, Japan
  • Takeshi Umeki
    NTT Device Technology Labs, NTT Corporation 1 , 3-1, Morinosato Wakamiya, Atsugi, Kanagawa 243-0198, Japan
  • Akira Furusawa
    Department of Applied Physics, School of Engineering, The University of Tokyo 2 , 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan

Description

<jats:p>Terahertz (THz)-bandwidth continuous-wave (CW) squeezed light is essential for integrating quantum processors with time-domain multiplexing (TDM) by using optical delay line interferometers. Here, we utilize a single-pass optical parametric amplifier (OPA) based on a single-spatial-mode periodically poled ZnO:LiNbO3 waveguide, which is directly bonded onto a LiTaO3 substrate. The single-pass OPA allows THz bandwidth, and the absence of higher-order spatial modes in the single-spatial-mode structure helps avoid degradation of squeezing. In addition, the directly bonded ZnO-doped waveguide has durability for high-power pump and shows small photorefractive damage. Using this waveguide, we observe CW 6.3-dB squeezing at 20-MHz sideband by balanced homodyne detection. This is the first realization of CW squeezing with a single-pass OPA at a level exceeding 4.5 dB, which is required for the generation of a two-dimensional cluster state. Furthermore, the squeezed light shows 2.5-THz spectral bandwidth. The squeezed light will lead to the development of a high-speed on-chip quantum processor using TDM with a centimeter-order optical delay line.</jats:p>

Journal

  • APL Photonics

    APL Photonics 5 (3), 036104-, 2020-03-01

    AIP Publishing

Citations (11)*help

See more

References(43)*help

See more

Related Projects

See more

Keywords

Details 詳細情報について

Report a problem

Back to top