Subdiffraction Quantum Imaging with Undetected Photons

TL;DR

This paper introduces a quantum imaging method that surpasses the diffraction limit by using undetected photons and photon correlations, enabling high-contrast, subdiffraction imaging at difficult spectral ranges.

Contribution

It presents a novel nonlinear imaging scheme utilizing undetected photons and photon-pair generation to achieve subdiffraction resolution beyond classical limits.

Findings

Overcomes diffraction limit using correlated photons

Enables high-contrast imaging with zero background

Suitable for imaging small objects in challenging spectral ranges

Abstract

We propose a nonlinear imaging scheme with undetected photons that overcomes the diffraction limit by transferring near-field information at one wavelength to far-field information of a correlated photon with a different wavelength generated through spontaneous photon-pair generation. At the same time, this scheme allows for retrieval of high-contrast images with zero background, making it a highly sensitive scheme for imaging of small objects at challenging spectral ranges with subdiffraction resolutions.