Waveguide Cavity Resonator as a Source of Optical Squeezing

``Squeezed'' states of light are the fundamental building blocks for continuous-variable quantum optics, so a quantum network for optical communication would seem to require a compact, efficient source of such states. Combining clever design with recent advances in waveguide materials engineering, the authors produce a device that yields very high levels of squeezing, compared to other integrated architectures. Their innovative approach allows for rarely seen continuous-wave squeezing, paving the way for more advanced on-chip functions.