# Quantum enhanced X-ray detection

## TL;DR

This paper demonstrates the first experimental use of quantum techniques to enhance x-ray detection, showing improved image quality and noise reduction using entangled photon pairs and photon number resolving detectors.

## Contribution

It introduces a novel protocol for quantum-enhanced x-ray detection, leveraging entangled photon pairs for background-free measurements and improved signal-to-noise ratio.

## Key findings

- Successful generation of heralded x-ray photons via spontaneous down-conversion.
- Observation of sub-Poissonian photon statistics in x-ray regime.
- Improved image visibility and noise performance in high-noise environments.

## Abstract

We present the first experimental demonstration of quantum-enhanced detection at x-ray wavelengths. We show that x-ray pairs that are generated by spontaneous down-conversion can be used for the generation of heralded x-ray photons and measure directly the sub-Poissonian statistics of the single photons by using photon number resolving detectors. We utilize the properties of the strong time-energy correlations of the down converted photons to demonstrate the ability to improve the visibility and the signal-to-noise ratio of an image with a small number of photons in an environment with a noise level that is higher than the signal by many orders of magnitude. In our work we demonstrate a new protocol for the measurement of quantum effects with x-rays using advantages such as background free measurements that the x-ray regime offers for experiments aiming at testing fundamental concepts in quantum optics.

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Source: https://tomesphere.com/paper/1907.04045