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Article Dans Une Revue Physical Review A Année : 2021

Energetic advantages of nonadiabatic drives combined with nonthermal quantum states

Résumé

Unitary drivings of quantum systems are ubiquitous in experiments and applications of quantum mechanics and the underlying energetic aspects, particularly relevant in quantum thermodynamics, are receiving growing attention. We investigate energetic advantages in unitary driving obtained from initial nonthermal states. We introduce the noncyclic ergotropy to quantify the energetic gains, from which coherent (coherence-based) and incoherent (population-based) contributions are identified. In particular, initial quantum coherences appear to be always beneficial, whereas nonpassive population distributions not systematically. Additionally, these energetic gains are accessible only through nonadiabatic dynamics, contrasting with the usual optimality of adiabatic dynamics for initial thermal states. Finally, following frameworks established in the context of shortcut to adiabaticity, the energetic cost related to the implementation of the optimal drives are analyzed and, in most situations, are found to be smaller than the energetic cost associated with shortcut to adiabaticity. We treat explicitly the example of a two-level system and show that energetic advantages increase with larger initial coherences, illustrating the interplay between initial coherences and the ability of the dynamics to consume and use coherences.
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hal-04520547 , version 1 (25-03-2024)

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Camille L Latune. Energetic advantages of nonadiabatic drives combined with nonthermal quantum states. Physical Review A, 2021, 103 (6), pp.062221. ⟨10.1103/PhysRevA.103.062221⟩. ⟨hal-04520547⟩
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