Entanglement and energy transportation in central-spin quantum battery  

作　　者：Fan Liu Hui-Yu Yang Shuai-Li Wang Jun-Zhong Wang Kun Zhang Xiao-Hui Wang 刘帆;杨慧宇;王帅立;王俊钟;张堃;王晓辉

机构地区：[1]School of Physics,Northwest University,Xi’an 710127,China [2]Shaanxi Key Laboratory for Theoretical Physics Frontiers,Xi’an 710127,China [3]Peng Huanwu Center for Fundamental Theory,Xi’an 710127,China

出　　处：《Chinese Physics B》2025年第2期141-147,共7页中国物理B(英文版)

基　　金：Project supported by the National Natural Science Foundation (Grant Nos. 12275215,12305028,and 12247103);the Major Basic Research Program of the Natural Science of Shaanxi Province,China (Grant No. 2021JCW-19);Shaanxi Fundamental Science Research Project for Mathematics and Physics (Grant No. 22JSZ005)。

摘　　要：Quantum battery exploits the principle of quantum mechanics to transport and store energy. We study the energy transportation of the central-spin quantum battery, which is composed of N_b spins serving as the battery cells, and surrounded by N_c spins serving as the charger cells. We apply the invariant subspace method to solve the dynamics of the central-spin battery with a large number of spins. We establish a universal inverse relationship between the battery capacity and the battery–charger entanglement, which persists in any size of the battery and charger cells. Moreover, we find that when N_b= N_c, the central-spin battery has the optimal energy transportation, corresponding to the minimal battery–charger entanglement. Surprisingly, the central-spin battery has a uniform energy transportation behaviors in certain battery–charger scales. Our results reveal a nonmonotonic relationship between the battery–charger size and the energy transportation efficiency, which may provide more insights on designing other types of quantum batteries.

关 键 词：central-spin quantum battery energy transportation ENTANGLEMENT 

分 类 号：O413[理学—理论物理] TM91[理学—物理]