High-sensitivity imaging with multi-mode twin beams

E. Brambilla, L. Caspani, O. Jedrkiewicz, L.A. Lugiato, A. Gatti

Research output: Contribution to journalArticlepeer-review

88 Citations (Scopus)


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.
Original languageEnglish
Article number053807
JournalPhysical Review A
Issue number5
Publication statusPublished - 8 May 2008


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