论文标题
连续波6-DB平方的光，单模PPLN波导的2.5-THZ带宽
Continuous-wave 6-dB-squeezed light with 2.5-THz-bandwidth from single-mode PPLN waveguide
论文作者
论文摘要
Terahertz（THZ） - 带宽连续波（CW）挤压光对于通过使用光学延迟线干涉仪与时域多路复用（TDM）集成量子处理器至关重要。在这里，我们基于单个空间模式定期螺旋的ZnO：Linbo3波导，它利用了单个空间模式的单次光学参数放大器（OPA），该ZnO：Linbo3 WaveGuide直接粘合到Litao3基板上。单次通用OPA允许带宽，并且单空间模式结构中没有高阶空间模式，有助于避免挤压的降解。此外，直接键合的ZnO掺杂波导具有高功率泵的耐用性，并显示出小的光致损伤。使用此波导，我们通过平衡的同伴检测观察到CW 6.3-DB在20 MHz的边带下挤压。这是用单个pass OPA在超过4.5 dB的水平上首次实现CW挤压，这是生成二维群集状态所必需的。此外，挤压的灯显示2.5-THz光谱带宽。挤压的光将使用带有厘米级光学延迟线的TDM导致高速芯片量子处理器的发展。
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 to 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.
