Fapesp Project 2022/09436-5 - After reaching 26 years of contributions in quantum optics and atomic physics, our group has gathered resources and expertise to follow the efforts in these research areas in their applications in quantum information and extreme measurements. Our present proposal will therefore stretch over different subjects in the field. We will investigate the creation of quantum entangled networks in continuous variables, using the parametric process of four wave mixing in atomic vapors, with applications in quantum computing using cluster states. Another subject will explore the ability to connect fields of distinct frequencies, separated by more than one octave, using teleportation protocols for non-classical states of the field (allowing the transfer of "qubits"). The goal here is to couple atomic lines to the telecommunication band in optical fibers by unconditional teleportation. We will investigate the behavior of parametric oscillators close to the oscillation threshold, exploring this phase transition by returning to the fundamentals of quantum optics to investigate the light produced in this condition. We will continue with the development of scalable sources of entangled states, using Si or Si$_3$N$_4$ microchips. We will begin the development of applications of X-ray photon correlation, aiming to use the high luminosity lines from the Sirius laboratory to implement high spatial resolution systems, with high energy photons, but in a minimum fluence regime to minimize damage to the samples under analysis. Finally, we will investigate the implementations of "bit commitment" proofs of principle, linking experiments to investigations of fundamental questions in quantum information.