On the principle of squeezing-induced quantum-enhanced multiphase estimation

We investigate how squeezing techniques can improve measurement precision in multiphase quantum metrology. While these methods are well-studied and used effectively in single-phase estimations, their use in multiphase situations has not been examined yet. We fill this gap by investigating the mechanism of quantum enhancement in these scenarios. Our analysis provides theoretical and numerical insights into the optimal condition for achieving the quantum Cramer-Rao bound, helping us understand the potential and mechanism for quantum-enhanced multiphase estimations with squeezing. This research opens up new possibilities for advancements in quantum metrology and sensing technologies.