This book focuses on new developments in quantum optics research. Chapters include computer-aided design (CAD) flow for large-scale quantum circuits; the effects of cooperation between the Stokes and anti-Stokes modes in Raman scattering processes and an analysis of the different properties, such as entanglement and quantum degree of polarization for two-mode states of the radiation field which is of great importance for a deeper understanding of the correlations that occur in the system.