In a small fermionic lattice, observational entropy matches Boltzmann-like behavior at its extreme values, while entanglement entropy can fall to near zero by emptying a subsystem.
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Typical and extreme entropies of long-lived isolated quantum systems
In a small fermionic lattice, observational entropy matches Boltzmann-like behavior at its extreme values, while entanglement entropy can fall to near zero by emptying a subsystem.