# Classical dynamical coarse-grained entropy and comparison with the quantum version

## TL;DR

This paper develops a rigorous classical observational entropy framework for non-equilibrium thermodynamics, compares it with quantum entropy, and explores its properties and correspondence with quantum concepts.

## Contribution

It introduces a detailed classical observational entropy framework, linking it to quantum entropy and analyzing its properties and classical-quantum correspondence.

## Key findings

- Classical observational entropy is well-defined out of equilibrium.
- It is additive and approaches thermodynamic entropy at equilibrium.
- The classical-quantum entropy correspondence is direct but affected by non-commutativity.

## Abstract

We develop the framework of classical Observational entropy, which is a mathematically rigorous and precise framework for non-equilibrium thermodynamics, explicitly defined in terms of a set of observables. Observational entropy can be seen as a generalization of Boltzmann entropy to systems with indeterminate initial conditions, and describes the knowledge achievable about the system by a macroscopic observer with limited measurement capabilities; it becomes Gibbs entropy in the limit of perfectly fine-grained measurements. This quantity, while previously mentioned in the literature, has been investigated in detail only in the quantum case. We describe this framework reasonably pedagogically, then show that in this framework, certain choices of coarse-graining lead to an entropy that is well-defined out of equilibrium, additive on independent systems, and that grows towards thermodynamic entropy as the system reaches equilibrium, even for systems that are genuinely isolated. Choosing certain macroscopic regions, this dynamical thermodynamic entropy measures how close these regions are to thermal equilibrium. We also show that in the given formalism, the correspondence between classical entropy (defined on classical phase space) and quantum entropy (defined on Hilbert space) becomes surprisingly direct and transparent, while manifesting differences stemming from non-commutativity of coarse-grainings and from non-existence of a direct classical analogue of quantum energy eigenstates.