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Proceedings Paper

Beating classical imaging limits with entangled photons
Author(s): Miles Padgett; Ermes Toninelli; Thomas Gregory; Paul-Antoine Moreau
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Paper Abstract

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.

Paper Details

Date Published: 1 March 2019
PDF: 6 pages
Proc. SPIE 10934, Optical, Opto-Atomic, and Entanglement-Enhanced Precision Metrology, 109341R (1 March 2019); doi: 10.1117/12.2515497
Show Author Affiliations
Miles Padgett, Univ. of Glasgow (United Kingdom)
Ermes Toninelli, Univ. of Glasgow (United Kingdom)
Thomas Gregory, Univ. of Glasgow (United Kingdom)
Paul-Antoine Moreau, Univ. of Glasgow (United Kingdom)

Published in SPIE Proceedings Vol. 10934:
Optical, Opto-Atomic, and Entanglement-Enhanced Precision Metrology
Selim M. Shahriar; Jacob Scheuer, Editor(s)

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