Beating classical imaging limits with entangled photons

Padgett, M. , Toninelli, E., Gregory, T. and Moreau, P.-A. (2019) Beating classical imaging limits with entangled photons. In: SPIE OPTO 2019, San Francisco, CA, USA, 02-07 Feb 2019, 109341R. (doi:10.1117/12.2515497)

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How can quantum mechanics deliver better imaging performance? Parametric down-conversion sources produce pairs of photons that are correlated in many degrees of freedom, including their spatial positions. By using a camera to detect these pairs of photons it is possible configure imaging systems that can either beat the classical resolution limit or the classical noise limit. We demonstrate how a simple down-conversion source based on a laser and non-linear crystal can be combined with an EMCCD camera to achieve either of these outcomes. Firstly, when both photons pass through the sample, we show a full-field, resolution-enhancing scheme, based on the centroid estimation of the photon pairs. By optimising the software control of the EMCCD camera running in the photon-sparse regime we achieve a resolution enhancement over the equivalent classical limit. Secondly, we show a similar scheme but where only one of the two photons pass through the sample and the other acts as a reference, in this case the ratio of the two resulting images eliminates the background noise of the camera, and background light, achieving an increase in image contrast.

Item Type:Conference Proceedings
Glasgow Author(s) Enlighten ID:Toninelli, Mr Ermes and Gregory, Mr Thomas and Moreau, Dr Paul-Antoine and Padgett, Professor Miles
Authors: Padgett, M., Toninelli, E., Gregory, T., and Moreau, P.-A.
College/School:College of Science and Engineering > School of Physics and Astronomy
Copyright Holders:Copyright © 2019 SPIE
First Published:First published in Proceedings of SPIE 10934:109341R
Publisher Policy:Reproduced in accordance with the copyright policy of the publisher

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