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Observational analysis demonstrated the significance of relative entropy in coherent states of Quantum Field Theory, suggesting insights into spacetime properties.
A numerical setup for investigating the Araki–Uhlmann relative entropy between two coherent states is presented for a scalar massive Quantum Field Theory in ( $$1+1$$ 1 + 1 )-dimensional Minkowski spacetime. These states are constructed using smeared Weyl operators compactly supported in two diamond regions belonging to the right Rindler wedge. Using this setup, we verified the known properties of the relative entropy, namely: positivity, increase with the size of the spacetime regions considered, decrease with the increase of the mass parameter. A linear increase with respect to the spatial distance between the two diamond regions is also observed.
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Caribé et al. (2025) studied this question.
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