Quantum Sensor Networks for Non-Local Sensing: Entanglement-Based Remote Measurement

The Quantum Sensor Network (QSN) is a novel quantum metrology framework that utilizes entanglement to enable non-local sensing, detecting remote perturbations without direct interaction. Unlike classical sensors, QSN measures changes in entanglement fidelity and Bell-state probability shifts to infer disturbances at a distant location. Monte Carlo simulations show that entanglement fidelity degrades exponentially with perturbation strength, while Quantum Fisher Information (QFI) scales quadratically with the number of sensors, exponentially enhancing sensitivity. A key application is seismic detection, where QSN could identify earthquakes before classical seismic waves arrive. The experimental proposal involves satellite-based entanglement distribution, fiber-optic quantum links, and weak measurement techniques. Noise analysis confirms that QSN remains functional if noise-induced Bell-state variations stay below 5%. Future work includes optimizing entanglement protocols, improving quantum error correction, and extending applications to quantum radar and gravitational sensing. QSN represents a paradigm shift in quantum-enhanced metrology, surpassing classical limits for remote sensing and fundamental physics exploration.