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Metrology with Unknown Detectors


Altorio, Matteo; Genoni, Marco G; Somma, Fabrizia; Barbieri, Marco (2016). Metrology with Unknown Detectors. Physical Review Letters, 116(10):100802.

Abstract

The best possible precision is one of the key figures in metrology, but this is established by the exact response of the detection apparatus, which is often unknown. There exist techniques for detector characterization that have been introduced in the context of quantum technologies but apply as well for ordinary classical coherence; these techniques, though, rely on intense data processing. Here, we show that one can make use of the simpler approach of data fitting patterns in order to obtain an estimate of the Cramér-Rao bound allowed by an unknown detector, and we present applications in polarimetry. Further, we show how this formalism provides a useful calculation tool in an estimation problem involving a continuous-variable quantum state, i.e., a quantum harmonic oscillator.

Abstract

The best possible precision is one of the key figures in metrology, but this is established by the exact response of the detection apparatus, which is often unknown. There exist techniques for detector characterization that have been introduced in the context of quantum technologies but apply as well for ordinary classical coherence; these techniques, though, rely on intense data processing. Here, we show that one can make use of the simpler approach of data fitting patterns in order to obtain an estimate of the Cramér-Rao bound allowed by an unknown detector, and we present applications in polarimetry. Further, we show how this formalism provides a useful calculation tool in an estimation problem involving a continuous-variable quantum state, i.e., a quantum harmonic oscillator.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:04 Faculty of Medicine > University Hospital Zurich > Clinic for Vascular Surgery
Dewey Decimal Classification:610 Medicine & health
Language:English
Date:11 March 2016
Deposited On:22 Mar 2019 07:36
Last Modified:25 Sep 2019 00:24
Publisher:American Physical Society
ISSN:0031-9007
OA Status:Green
Publisher DOI:https://doi.org/10.1103/PhysRevLett.116.100802
PubMed ID:27015467

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