# Phase and amplitude imaging with quantum correlations through Fourier Ptychography

## TL;DR

This paper introduces a quantum-correlation based Fourier Ptychography method that captures high-resolution phase and amplitude images with very few photons, overcoming noise limitations of conventional imaging.

## Contribution

It presents a novel quantum correlation-enabled Fourier Ptychography technique that reconstructs phase and amplitude images using heralded single photons, a significant advancement over intensity-only quantum imaging.

## Key findings

- Successfully demonstrated high-resolution phase and amplitude imaging with few photons.
- Achieved higher signal-to-noise ratio compared to traditional methods.
- Enabled non-scanning Fourier Ptychographic acquisition.

## Abstract

Extracting as much information as possible about an object when probing with a limited number of photons is an important goal with applications from biology and security to metrology. Imaging with a few photons is a challenging task as the detector noise and stray light are then predominant, which precludes the use of conventional imaging methods. Quantum correlations between photon pairs has been exploited in a so called 'heralded imaging scheme' to eliminate this problem. However these implementations have so-far been limited to intensity imaging and the crucial phase information is lost in these methods. In this work, we propose a novel quantum-correlation enabled Fourier Ptychography technique, to capture high-resolution amplitude and phase images with a few photons. This is enabled by the heralding of single photons combined with Fourier ptychographic reconstruction. We provide experimental validation and discuss the advantages of our technique that include the possibility of reaching a higher signal to noise ratio and non-scanning Fourier Ptychographic acquisition.