Quantum‐Enhanced Optomechanical Sensor Network

ABSTRACT Distributed quantum sensing (DQS), an essential branch of quantum metrology, can substantially boost the sensitivity and reliability in multi‐parameter estimation, achieving the Heisenberg scaling. Here, we report the first experimental demonstration of a quantum‐enhanced optomechanical sensor network, achieving the DQS advantage of a maximum ‐fold increase trend with sensor number. The challenge of poor uniformity is addressed by decoupling and independently manipulating each optomechanical parameter, and the acquired inconsistencies are less than 2.4%. By tailoring a four‐partite entangled state, the acquired quantum advantage is 57.3% compared to that with coherent probes, and 23.7% compared to that with the separable scheme. Moreover, the quantum enhanced optomechanical sensor network is applied to estimate incoherent forces, enhancing the estimation resolution by 33.7% in contrast with the separable scheme. The entanglement‐enhanced optomechanical sensors with high consistency pave the way for future large‐scale quantum sensor network, facilitating the micro‐seismic epicenter locating, dark matter searching, and so on.