Dichotomy in the effect of chaos on ergotropy

• URL: http://arxiv.org/abs/2409.16587v1
• Date: Wed, 25 Sep 2024 03:28:04 GMT
• Title: Dichotomy in the effect of chaos on ergotropy
• Authors: Sreeram PG, J. Bharathi Kannan, S. Harshini Tekur, M. S. Santhanam,
• Abstract summary: We study ergotropy, the maximum unitarily extractable work from a system, in two quantum chaotic models. In an ancilla-assisted scenario, chaos enhances ergotropy when the state is known. In contrast, we establish a negative correlation between chaos and work when the state is unknown.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We study ergotropy, the maximum unitarily extractable work from a system, in two quantum chaotic models: the quantum kicked top and the kicked Ising spin chain. 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, we establish a negative correlation between chaos and work when the state is unknown. The downside arises from chaos impeding information gain of the system from coarse-grained measurements. When both entanglement and coarse-grained measurements are present, there is competition between the two, and the ergotropy initially increases, followed by a decrease at larger kick-strengths.

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