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Abstract: Properties of quantum states have disclosed new technologies, ranging fromquantum information to quantum metrology. Among them a recent research field isquantum imaging, addressed to overcome limits of classical imaging byexploiting spatial properties of quantum states of light . In particularquantum correlations between twin beams represent a fundamental resource forthese studies. One of the most interesting proposed scheme exploits spatialquantum correlations between parametric down conversion light beams forrealizing sub-shot-noise imaging of the weak absorbing objects, leading ideallyto a noise-free imaging. Here we present the first experimental realisation ofthis scheme, showing its capability to reach a larger signal to noise ratioSNR with respect to classical imaging methods. This work represents thestarting point of this quantum technology that can have relevant applications,especially whenever there is a need of a low photon flux illumination e.g. aswith certain biological samples.



Author: G. Brida, M. Genovese, I. Ruo Berchera

Source: https://arxiv.org/







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