Instability-enhanced quantum sensing with tunable multibody interactions
The study investigates using dynamical instabilities to amplify small quantum signals for enhanced sensing beyond standard limits. While a quadratic Hamiltonian shows this effect, adding a quartic term representing multibody interactions significantly boosts signal amplification. This enhancement is due to reshaping the phase space, creating more unstable points with larger growth rates, proving that nonlinear interactions are crucial for optimizing sensor performance.