科普文章

JPhysA研究文章|量子电池退相干充电中的渐近自由性

26 Feb 2026 gabriels

Quantum batteries (QBs)—small-scale energy storage devices based on quantum systems—offer the potential for enhanced charging performance through quantum effects such as coherence and collectivity. In this work, we study the collective charging of QBs consisting of N qubits, coupled to a driven qubit charger in a star configuration, with controlled pure dephasing acting on the charger. We investigate how an ‘asymptotic freedom’-like behavior—in which all the energy deposited into the battery can be extracted as work, resulting in the ergotropy-to-energy ratio approaching unity—can emerge in the steady state of the battery. We show that the ergotropy-to-energy ratio increases with the number of qubits and approaches unity asymptotically as 1-O(1/N). In the large-N limit, the emergence of approximate ground-state degeneracy of the collective battery system leads to this asymptotic freedom behavior, despite the battery state remaining mixed. We also discuss the scaling behavior of the charging time of the battery with N.

文章介绍

Asymptotic freedom in the dephased charging of quantum batteries

Chayan Purkait, B Prasanna Venkatesh and Gentaro Watanabe

通讯作者：

Gentaro Watanabe，浙江大学

期刊介绍

Journal of Physics A: Mathematical and Theoretical

2024年影响因子：2.1 Citescore：3.8
Journal of Physics A: Mathematical and Theoretical（JPhysA）每年出版50期，针对运用数学结构来描述物理世界的基本过程，并探索这些结构的分析、计算和数值方法。期刊内容涵盖：统计物理；非平衡系统、计算方法和现代平衡理论；混沌和复杂系统；数学物理；量子力学和量子信息理论；场论和弦理论；流体和等离子体理论；生物模型等方面。文章类型包括原创性论文和综述，以及关注于热点研究的专题综述和特刊，提供及时、全面的纵览。