  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.
