Quantum enhanced non-interferometric quantitative phase imaging

Giuseppe Ortolano*, Alberto Paniate, Pauline Boucher, Carmine Napoli, Sarika Soman, Silvania F. Pereira, Ivano Ruo-Berchera, Marco Genovese

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

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Abstract

Quantum entanglement and squeezing have significantly improved phase estimation and imaging in interferometric settings beyond the classical limits. However, for a wide class of non-interferometric phase imaging/retrieval methods vastly used in the classical domain, e.g., ptychography and diffractive imaging, a demonstration of quantum advantage is still missing. Here, we fill this gap by exploiting entanglement to enhance imaging of a pure phase object in a non-interferometric setting, only measuring the phase effect on the free-propagating field. This method, based on the so-called “transport of intensity equation", is quantitative since it provides the absolute value of the phase without prior knowledge of the object and operates in wide-field mode, so it does not need time-consuming raster scanning. Moreover, it does not require spatial and temporal coherence of the incident light. Besides a general improvement of the image quality at a fixed number of photons irradiated through the object, resulting in better discrimination of small details, we demonstrate a clear reduction of the uncertainty in the quantitative phase estimation. Although we provide an experimental demonstration of a specific scheme in the visible spectrum, this research also paves the way for applications at different wavelengths, e.g., X-ray imaging, where reducing the photon dose is of utmost importance.

Original languageEnglish
Article number171
Number of pages11
JournalLight: Science and Applications
Volume12
Issue number1
DOIs
Publication statusPublished - 2023

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