Entangled Quantum Sensor Network

This simulator models a distributed quantum sensor network estimating a weak external phase signal, and lets you compare the two fundamental strategies for combining N sensor nodes: independent (product-state) probes, which scale at the Standard Quantum Limit Δφ ∝ 1/√N, and GHZ-entangled probes, which can reach the Heisenberg limit Δφ ∝ 1/N when noise-free. A real decoherence model shows why entanglement doesn't always win — collective dephasing grows with the number of entangled nodes, so past a critical noise level the "quantum-enhanced" network loses its advantage back to plain independent sensors. Adjust the node count, decoherence rate and network topology (star/ring/chain) and watch the live Fisher-information readout and phase-estimate needle respond in real time.