4.5 Article

Diagnosing Imperfections in Quantum Sensors via Generalized Cramer-Rao Bounds

Journal

PHYSICAL REVIEW APPLIED
Volume 13, Issue 2, Pages -

Publisher

AMER PHYSICAL SOC
DOI: 10.1103/PhysRevApplied.13.024048

Keywords

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Funding

  1. PRita Levi-Montalcini fellowship of MIUR
  2. Amaldi Research Center - Ministero dell'Istruzione dell'Universita e della Ricerca (Ministry of Education, University and Research) program Dipartimento di Eccellenza [CUP:B81I18001170001]
  3. Regione Lazio programme Progetti di Gruppi di ricerca legge Regionale via LazioInnova spa [13/2008, 85-2017-15200]

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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.

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