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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Abstract
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 |
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| Status: | Published |
| Refereed: | Yes |
| Glasgow Author(s) Enlighten ID: | Gibson, Dr Graham and Hammond, Professor Giles and Padgett, Professor Miles and Edgar, Dr Matthew and Moreau, Dr Paul-Antoine and Toninelli, Mr Ermes |
| 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 |
| Research Centre: | College of Science and Engineering > School of Physics and Astronomy > Institute for Gravitational Research |
| Journal Name: | Optics Express |
| Publisher: | Optical Society of America |
| ISSN: | 1094-4087 |
| 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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