- Letter
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Typical positivity of nonequilibrium entropy production for pure states
Phys. Rev. E 111, L042106 – Published 24 April, 2025
DOI: https://doi.org/10.1103/PhysRevE.111.L042106
Abstract
We establish that the nonequilibrium dynamics of most pure states gives rise to the same entropy production (EP) as that of the corresponding ensemble, provided the effective dimension of the ensemble is large enough. This establishes the positivity of EP under a wide variety of nonequilibrium situations. Our results follow from dynamical typicality and suitable continuity properties alone, without relying on nonintegrability, and they complement other recent efforts to establish pure state second laws. An explicit comparison with the distinctively different two-point measurement scheme is also provided.
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