First demonstration of two tunable squeezed-light sources on a single thin-film lithium niobate chip for quantum entanglement

Summary

Researchers demonstrate the fabrication of two indistinguishable and independently controllable optical parametric oscillators on a thin-film lithium niobate (TFLN) platform, achieving up to 0.5 dB of directly measured squeezing from each source. By interfering the two modes on a beam splitter, they generate an EPR-type two-mode squeezed state and verify continuous-variable entanglement through the Duan-Simon inseparability criterion. This marks the first demonstration of two independently tunable squeezed-light sources on a single TFLN chip for generating continuous-variable entanglement, representing a key step toward scalable photonic quantum information processing and continuous-variable quantum computing.