High-sensitivity imaging with multi-mode twin beams

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

Research output: Contribution to journalArticle

61 Citations (Scopus)

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.

Original languageEnglish
Article number053807
Number of pages11
JournalPhysical Review A - Atomic, Molecular, and Optical Physics
Volume77
Issue number5
DOIs
Publication statusPublished - 8 May 2008
Externally publishedYes

    Fingerprint

Keywords

  • quantum imaging
  • optical signals
  • twin beams

Cite this