A chip-scale CMOS-compatible platform for generation of squeezed light with high squeezing ratio

We introduce and theoretically demonstrate the performance of a new on-chip device platform for the generation of squeezed light with the potential to achieve a record-high squeezing ratio (SR) exceeding 16 dB, aimed at ultra-low-noise optical detection. Our heterogeneous platforms integrated silicon-carbide integrated photonic devices with an ultra-high-Q (Q: quality factor) whispering-gallery-mode (WGM) microresonator formed in potassium titanyl phosphate (KTP) for second-harmonic generation. Using an interferometric design, the squeezed signal and local oscillator (LO) are mixed with over 99.5% detection efficiency, making this platform a high-performance, CMOS-compatible solution for integrated quantum optics applications.