High-sensitivity imaging with multi-mode twin beams

TL;DR

This paper introduces a differential imaging scheme using entangled twin beams from parametric down-conversion to detect weak absorption with sensitivity surpassing classical limits, leveraging spatial quantum correlations.

Contribution

It presents a novel imaging method that exploits spatial quantum correlations in twin beams for enhanced sensitivity beyond shot-noise limits.

Findings

Achieves sensitivity beyond standard quantum limit

Utilizes type II PDC for spatial quantum correlations

Demonstrates improved weak absorption detection

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.