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Phys Rev Lett. 2016 Mar 11;116(10):100802. doi: 10.1103/PhysRevLett.116.100802. Epub 2016 Mar 8.

Metrology with Unknown Detectors.

Author information

1
Dipartimento di Matematica e Fisica, Università degli Studi Roma Tre, Via della Vasca Navale 84, 00146 Rome, Italy.
2
Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, United Kingdom.
3
Dipartimento di Scienze, Università degli Studi Roma Tre, Via della Vasca Navale 84, 00146 Rome, Italy.

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.

PMID:
27015467
DOI:
10.1103/PhysRevLett.116.100802
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