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Optimal information on something invisible

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How to measure objects that cannot be seen under normal circumstances ? There is a way to modify the beam of a laser so that it provides exactly the information desired despite the presence of an environment that can be complex and messy. Moreover, this procedure does not work in an approximate way, but in an optimal way in the physical sense of the term : nature does not allow for better measuring accuracy with the coherent light of a laser.

Voir en ligne : Maximum information states for coherent scattering measurements, Dorian Bouchet, Stefan Rotter & Allard P. Mosk. Nature Physics jan. 2021