Quantum enhanced estimation of optical detector efficiencies

Title: Quantum enhanced estimation of optical detector efficiencies
Authors: Barbieri, M
Datta, A
Bartley, TJ
Jin, X-M
Kolthammer, WS
Walmsley, IA
Item Type: Journal Article
Abstract: Quantum mechanics establishes the ultimate limit to the scaling of the precision on any parameter, by identifying optimal probe states and measurements. While this paradigm is, at least in principle, adequate for the metrology of quantum channels involving the estimation of phase and loss parameters, we show that estimating the loss parameters associated with a quantum channel and a realistic quantum detector are fundamentally different. While Fock states are provably optimal for the former, we identify a crossover in the nature of the optimal probe state for estimating detector imperfections as a function of the loss parameter using Fisher information as a benchmark. We provide theoretical results for on-off and homodyne detectors, the most widely used detectors in quantum photonics technologies, when using Fock states and coherent states as probes.
Issue Date: 5-Dec-2016
Date of Acceptance: 9-Mar-2016
ISSN: 2299-114X
Publisher: De Gruyter Open
Start Page: 9
End Page: 14
Journal / Book Title: Quantum Measurements and Quantum Metrology
Volume: 3
Issue: 1
Copyright Statement: © 2016 Marco Barbieri et al., published by De Gruyter Open. This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License (
Sponsor/Funder: Engineering & Physical Science Research Council (E
Funder's Grant Number: EP/K034480/1
Keywords: quant-ph
Publication Status: Published
Open Access location:
Appears in Collections:Quantum Optics and Laser Science

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