Scientific Results

Sensitivity Bounds for Multiparameter Quantum Metrology

Year: 2018

Authors: Gessner M., Pezze L., Smerzi A.

Autors Affiliation: CNR INO, QSTAR, Largo Enrico Fermi 2, I-50125 Florence, Italy; LENS, Largo Enrico Fermi 2, I-50125 Florence, Italy

Abstract: We identify precision limits for the simultaneous estimation of multiple parameters in multimode interferometers. Quantum strategies to enhance the multiparameter sensitivity are based on entanglement among particles, modes, or combining both. The maximum attainable sensitivity of particle-separable states defines the multiparameter shot-noise limit, which can be surpassed without mode entanglement. Further enhancements up to the multiparameter Heisenberg limit are possible by adding mode entanglement. Optimal strategies that saturate the precision bounds are provided.

Journal/Review: PHYSICAL REVIEW LETTERS

Volume: 121 (13)      Pages from: 130503-1  to: 130503-7

KeyWords: states; clocks; light
DOI: 10.1103/PhysRevLett.121.130503

Citations: 5
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