This line aims to understand and quantify quantum entanglement in many-body systems and to exploit it to enhance measurement precision in quantum metrology. At its core, this line establishes criteria for detecting entanglement in bipartite Dicke states, alongside methods that optimize quantum Fisher information. A further focus is the analysis of states with positive partial transposition, as well as the exact quantification of entanglement in families of symmetric states and numerical approaches for estimating extended entanglement measures. Foundational aspects of quantum measurement theory and their role in optimal information extraction are also addressed. In the context of light–matter interactions, models and experimental protocols are developed to optimize quantum channels and sensing schemes using resources such as entanglement and squeezing, with applications in high-precision detection, navigation, and quantum communications.
