Diagnosing Imperfections in Quantum Sensors via Generalized Cramer-Rao Bounds
Authors: Cimini V., Genoni MG., Gianani I., Spagnolo N., Sciarrino F., Barbieri M.
Autors Affiliation: Univ Roma Tre, Dipartimento Sci, Via Vasca Navale 84, I-00146 Rome, Italy; Univ Milan, Dipartimento Fis Aldo Pontremoli, Quantum Technol Lab, I-20133 Milan, Italy; Sapienza Univ Roma, Dipartimento Fis, I-00185 Rome, Italy; Ist Nazl Ottica, CNR, Largo Enrico Fermi 6, I-50125 Florence, Italy
Abstract: Quantum metrology derives its capabilities from the careful employ of quantum resources for carrying out measurements. This advantage, however, relies on refined data postprocessing, assessed based on the variance of the estimated parameter. When Bayesian techniques are adopted, more elements become available for assessing the quality of the estimation. Here we adopt generalized classical Cramer-Rao bounds for looking in detail into a phase-estimation experiment performed with quantum light. In particular, we show that the third-order absolute moment can give a superior capability in revealing biases in the estimation, compared to standard approaches. Our studies point to the identification of an alternative strategy that brings a possible advantage in monitoring the correct operation of high-precision sensors.
Journal/Review: PHYSICAL REVIEW APPLIED
Volume: 13 (2) Pages from: 024048 to: 024048