Metrological usefulness of entanglement and nonlinear Hamiltonians
Satoya Imai, Augusto Smerzi, Luca Pezzè · Physical Review A · 2025
The authors establish metrological criteria for entanglement in quantum systems with nonlinear Hamiltonians, deriving separability bounds for quantum Fisher information. Their findings reveal classes of entangled states beyond GHZ-like structures, offering insights into the metrological advantages of nonlinear dynamics.