Multipartite entanglement (ME) is an essential resource for advancing the next generation of quantum technologies, including quantum sensing and computation. However, detecting and characterizing ME is particularly challenging due to the need to analyze states in large Hilbert spaces. In this talk, I will introduce the concept of quantum entanglement, highlighting its distinctions from classical correlations. I will then present a novel approach to detecting and characterizing multipartite entanglement by analyzing how quantum-correlated states respond to external perturbations. Finally, I will demonstrate that these states are capable of achieving ultrasensitive performance in general phase estimation protocols.
Acknowledgements: This work has been partially supported by the NQSTI