Abstract:
In physics we study systems of particles and fields and we try to develop theoretical models to reproduce the observations we are making. It is typically not the system per se which is classical or quantum. We rather may
succeed in reproducing one observation on a particular system with a classical model, while a quantum model may be required for modelling another observation on one and the same system. In the talk I will provide
examples of such scenarios and emphasize that a main difference between a classical and a quantum theory is the nature of the measurement process.

(Refs.: N Korolkova and G Leuchs 2019 Rep. Prog. Phys. 82 056001; N Korolkova, LL Sánchez-Soto, G Leuchs, 2022 in preparation)

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