Quantum metrology is a field of science that utilizes principles from quantum mechanics to improve the precision and accuracy of measurements. It leverages quantum phenomena, such as superposition and entanglement, to enhance measurement sensitivity beyond what is possible with classical techniques. The core idea of quantum metrology is to use quantum states of light or matter to probe physical systems with greater precision.
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Quantum metrology studies estimation of physical parameters using quantum states, evolution and measurements. A parameter changes the probe state; the measurement outcome distribution carries information about that change.
For independent comparable probes, uncertainty often scales as . Entangled states can improve scaling under suitable ideal resource assumptions, but losses, decoherence and the allowed preparation and measurement operations matter. Quoting an enhanced sensitivity requires identifying what counts as a resource and which noise model is being compared. Quantum Fisher information bounds the attainable local precision under specified estimation assumptions.