Tiny Shifts Amplified: New Sensors Detect Weak Signals with Greater Precision

Javid Naikoo and colleagues have found that amplified responses within cavity optomechanical systems sharply improve quantum sensing. Carefully tuning these systems to increase their susceptibility allows weak disturbances to create substantial changes, boosting estimation precision. Utilising Gaussian estimation theory, the work reveals a divergent scaling of quantum Fisher information with decreasing perturbation strength, suggesting a corresponding reduction in estimation error. Importantly, the improved sensitivity is achievable using conventional heterodyne detection, identifying amplified optomechanical dynamics as a key and controllable resource for quantum-enhanced sensing and metrology. The quantum Fisher information diverges as the perturbation strength decreases, representing a previously unattainable sensitivity threshold. This…