Continuous-variable quantum systems provide a versatile platform for exploiting non-classical correlations in precision measurement and information encoding. In this talk, I will present my work on the characterization and utilization of non-classical states, including squeezed states of light and two-mode squeezed states. I will discuss how such states enable quantum-enhanced correlated interferometry for detecting faint signals and demonstrate how spatial correlations in entangled light can be harnessed for information encoding accessible only through joint measurements. I will also describe recent efforts towards establishing optical networking of superconducting quantum nodes via opto-electro-mechanical transduction. In this work, I investigated the generation and characterization of bright non-degenerate twin-beam states and analyzed the transducer performance by quantifying conversion efficiency, added noise, and information capacity within a Gaussian-channel framework