The lines of research are both fundamental and applied. On the fundamental side, we study the role and implication of quantum entanglement. In particular, we investigate the quantum Fisher information as a witness of multipartite entanglement. The Fisher information is linked to the speed at which quantum states evolve and has implications in quantum phase transitions, quantum metrology, quantum coherence, etc. Applications of our theory to quantum technologies are in sensing (with Mach-Zehnder interferometers for the estimation of one of more phase shifts), quantum algorithm (in particular the quantum phase estimation that is an ubiquitous subroutine in algorithms achieving an exponential speed-up), metrology (with atomic clocks, gravimeters, accelerometers, etc.) and the realization of quantum simulators (with photons, trapped ions, Bose-Einstein condensates and Rydberg atoms).