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Negative Quasiprobabilities Enhance Phase Estimation in Quantum-Optics Experiment

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Abstract

Uncertainty principles limit measurement precision, via operator noncommutation. Wielded correctly, noncommutation can boost precision. We relate metrological enhancement with negative quasiprobabilities, quantum extensions of probabilities. In a phase measurement, we amplify the precision per detected photon by two orders of magnitude.

© 2023 The Author(s)

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