# Quantum differential ghost microscopy

## TL;DR

This paper introduces a quantum ghost imaging protocol that compensates for detection noise and losses, enabling low-brightness, high-resolution imaging of biological objects using quantum correlations.

## Contribution

The authors develop and experimentally validate a noise-resilient quantum ghost imaging method based on differential ghost imaging with SPDC light.

## Key findings

- Successfully reconstructed a biological object with 5 micrometers resolution.
- Validated the theoretical model through experimental results.
- Demonstrated robustness against detection noise and losses in quantum imaging.

## Abstract

Quantum correlations become formidable tools for beating classical capacities of measurement. Preserving these advantages in practical systems, where experimental imperfections are unavoidable, is a challenge of the utmost importance. Here we propose and realize a quantum ghost imaging protocol able to compensate for the detrimental effect of detection noise and losses. This represents an important improvement as quantum correlations allow low brightness imaging, desirable for reducing the absorption dose. In particular, we develop a comprehensive model starting from a ghost imaging scheme elaborated for bright thermal light, known as differential ghost imaging and particularly suitable in the relevant case of faint or sparse objects. We perform the experiment using SPDC light in microscopic configuration. The image is reconstructed exploiting non-classical intensity correlation rather than photon pairs detection coincidences. On one side we validate the theoretical model and on the other we show the applicability of this technique by reconstructing a biological object with 5 micrometers resolution.