Contributions from populations and coherences in non-equilibrium entropy production
| Autor: | Martí Perarnau-Llobet, Adalberto D. Varizi, Gabriel T. Landi, Raphael C. Drumond, Mariana Afeche Cipolla |
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| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Physics
ENTROPIA Quantum Physics Kullback–Leibler divergence Statistical Mechanics (cond-mat.stat-mech) Entropy production General Physics and Astronomy FOS: Physical sciences 01 natural sciences 010305 fluids & plasmas Entropy (classical thermodynamics) symbols.namesake 0103 physical sciences Quantum system symbols Radius of convergence Statistical physics 010306 general physics Hamiltonian (quantum mechanics) Quantum Physics (quant-ph) Quantum Condensed Matter - Statistical Mechanics Coherence (physics) |
| Zdroj: | Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual) Universidade de São Paulo (USP) instacron:USP |
| Popis: | The entropy produced when a quantum system is driven away from equilibrium can be decomposed in two parts, one related with populations and the other with quantum coherences. The latter is usually based on the so-called relative entropy of coherence, a widely used quantifier in quantum resource theories. In this paper we argue that, despite satisfying fluctuation theorems and having a clear resource-theoretic interpretation, this splitting has shortcomings. First, it predicts that at low temperatures the entropy production will always be dominated by the classical term, irrespective of the quantum nature of the process. Second, for infinitesimal quenches, the radius of convergence diverges exponentially as the temperature decreases, rendering the functions non-analytic. Motivated by this, we provide here a complementary approach, where the entropy production is split in a way such that the contributions from populations and coherences are written in terms of a thermal state of a specially dephased Hamiltonian. The physical interpretation of our proposal is discussed in detail. We also contrast the two approaches by studying work protocols in a transverse field Ising chain, and a macrospin of varying dimension. Comments are welcome! |
| Databáze: | OpenAIRE |
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