Quantum Ergotropy and Quantum Feedback Control

• URL: http://arxiv.org/abs/2303.04977v2
• Date: Thu, 15 Jun 2023 07:57:20 GMT
• Title: Quantum Ergotropy and Quantum Feedback Control
• Authors: Kenta Koshihara, Kazuya Yuasa
• Abstract summary: We study the energy extraction from and charging to a finite-dimensional quantum system by general quantum operations. We prove that the changes in energy induced by unital quantum operations are limited by the ergotropy/charging bound for unitary quantum operations.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: We study the energy extraction from and charging to a finite-dimensional quantum system by general quantum operations. We prove that the changes in energy induced by unital quantum operations are limited by the ergotropy/charging bound for unitary quantum operations. This implies that, in order to break the ergotropy/charging bound for unitary quantum operations, one needs to perform a quantum operation with feedback control. We also show that the ergotropy/charging bound for unital quantum operations, applied to initial thermal equilibrium states, is tighter than the inequality representing the standard second law of thermodynamics without feedback control.

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