What Makes Quantum Sensing So Special? Principles, Limits and Applications

In short Three quantum properties do the work: superposition, entanglement and coherence let quantum sensors respond to tiny fields and keep their phase long enough to measure them precisely. They beat classical noise limits. Entangled particles push precision from the standard quantum limit (1/√N) towards the Heisenberg limit (1/N), and squeezed light or atoms cut […]
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