Twin entangled beams produced by single-pass parametric down-conversion (PDC) offer the opportunity to detect weak amount of absorption with an improved sensitivity with respect to standard techniques which make use of classical light sources. We propose a differential measurement scheme which exploits the spatial quantum correlation of type-II PDC to image a weak amplitude object with a sensitivity beyond the standard quantum limit imposed by shot noise. By applying a quantitative numerical model to a specific PDC system (a type-II beta-barium borate crystal), we are able to identify conditions in parameter space suitable for a substantial enhancement of the imaging sensitivity, and we investigate the robustness of this enhancement against experimental imperfections.

High-sensitivity imaging with multi-mode twin beams

BRAMBILLA, ENRICO;Caspani, L.;JEDRKIEWICZ, OTTAVIA;LUGIATO, LUIGI;GATTI, ALESSANDRA CARLA
2008-01-01

Abstract

Twin entangled beams produced by single-pass parametric down-conversion (PDC) offer the opportunity to detect weak amount of absorption with an improved sensitivity with respect to standard techniques which make use of classical light sources. We propose a differential measurement scheme which exploits the spatial quantum correlation of type-II PDC to image a weak amplitude object with a sensitivity beyond the standard quantum limit imposed by shot noise. By applying a quantitative numerical model to a specific PDC system (a type-II beta-barium borate crystal), we are able to identify conditions in parameter space suitable for a substantial enhancement of the imaging sensitivity, and we investigate the robustness of this enhancement against experimental imperfections.
2008
http://journals.aps.org/pra/abstract/10.1103/PhysRevA.77.053807
Brambilla, Enrico; Caspani, L.; Jedrkiewicz, Ottavia; Lugiato, Luigi; Gatti, ALESSANDRA CARLA
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11383/1709451
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