Related papers: Dichotomy in the effect of chaos on ergotropy

Dichotomy in the effect of chaos on ergotropy

URL: http://arxiv.org/abs/2409.16587v2
Date: Thu, 05 Dec 2024 12:59:01 GMT
Title: Dichotomy in the effect of chaos on ergotropy
Authors: Sreeram PG, J. Bharathi Kannan, S. Harshini Tekur, M. S. Santhanam,
Abstract summary: The maximum unitarily extractable work from a quantum system -- ergotropy -- is a useful idea in quantum thermodynamics. This work is studied in quantum chaotic systems to illustrate the effects arising from chaotic dynamics.
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Abstract: The maximum unitarily extractable work from a quantum system -- ergotropy -- is a useful and emerging idea in quantum thermodynamics. In this work, ergotropy is studied in quantum chaotic systems to illustrate the effects arising from chaotic dynamics. In an ancilla-assisted scenario, chaos enhances ergotropy when the state is known, a consequence of large entanglement production in the chaotic regime. In contrast, when the state is unknown, chaos impedes work extraction. This downside arises from chaos suppressing information gain about the system from coarse-grained measurements. When both entanglement and coarse-grained measurements are present, there is competition between the two, and ergotropy reaches maximum at an optimal value of the chaos parameter, followed by a decrease. The fall in ergotropy is due to chaos impeding measurements in the chaotic regime. These results are illustrated using two quantum chaotic models; the quantum kicked top and the kicked Ising spin chain.

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