An example of quantum imaging: rendering an object undetectable

TL;DR

This paper proposes a thought experiment demonstrating that, under specific conditions, an object can be made undetectable in quantum imaging, potentially advancing future quantum imaging technologies.

Contribution

It introduces a novel quantum imaging effect involving three non-linear crystals and two objects, extending previous experiments and predicting new undetectability phenomena.

Findings

Objects can be rendered undetectable to signal photon detection.

The effect depends on specific configurations of non-linear crystals and idler beams.

Potential applications in quantum imaging techniques.

Abstract

In this paper we propose and analyse a Gedankenexperiment involving three non-linear crystals and two objects inserted in the idler beams. We show that, besides the behaviour that can be extrapolated from previous experiments involving two crystals and one object, we are able to predict a new effect: under certain circumstances, one of the objects can be rendered undetectable to any single detection rate on the signal photons with discarded idler photons. This effect could find applications in future developments of quantum imaging techniques.