Sub-shot-noise shadow sensing with quantum correlations

Toninelli, E., Edgar, M. P., Moreau, P.-A. , Gibson, G. M. , Hammond, G. D. and Padgett, M. (2017) Sub-shot-noise shadow sensing with quantum correlations. Optics Express, 25(18), pp. 21826-21840. (doi: 10.1364/OE.25.021826)

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The quantised nature of the electromagnetic field sets the classical limit to the sensitivity of position measurements. However, techniques based on the properties of quantum states can be exploited to accurately measure the relative displacement of a physical object beyond this classical limit. In this work, we use a simple scheme based on the split-detection of quantum correlations to measure the position of a shadow at the single-photon light level, with a precision that exceeds the shot-noise limit. This result is obtained by analysing the correlated signals of bi-photon pairs, created in parametric downconversion and detected by an electron multiplying CCD (EMCCD) camera employed as a split-detector. By comparing the measured statistics of spatially anticorrelated and uncorrelated photons we were able to observe a significant noise reduction corresponding to an improvement in position sensitivity of up to 17% (0.8dB). Our straightforward approach to sub-shot-noise position measurement is compatible with conventional shadow-sensing techniques based on the split-detection of light-fields, and yields an improvement that scales favourably with the detector’s quantum efficiency.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Gibson, Dr Graham and Edgar, Dr Matthew and Toninelli, Mr Ermes and Hammond, Professor Giles and Moreau, Dr Paul-Antoine and Padgett, Professor Miles
Authors: Toninelli, E., Edgar, M. P., Moreau, P.-A., Gibson, G. M., Hammond, G. D., and Padgett, M.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Optics Express
Publisher:Optical Society of America
ISSN (Online):1094-4087
Published Online:29 August 2017
Copyright Holders:Copyright © 2017 The Authors
First Published:First published in Optics Express 25(18):21826-21840
Publisher Policy:Reproduced under a Creative Commons License

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
636381EPSRC Centre for Doctoral Training in Sensing and MeasurementAndrew HarveyEngineering and Physical Sciences Research Council (EPSRC)EP/L016753/1SCHOOL OF PHYSICS & ASTRONOMY
6672319UK Quantum Technology Hub in Enhanced Quantum ImagingMiles PadgettEngineering and Physical Sciences Research Council (EPSRC)EP/M01326X/1S&E P&A - PHYSICS & ASTRONOMY
717951IMAGITMiles PadgettEuropean Commission (EC)706410S&E P&A - PHYSICS & ASTRONOMY
624501TWISTS - Twists & more: the complex shape of lightMiles PadgettEuropean Research Council (ERC)340507S&E P&A - PHYSICS & ASTRONOMY