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Optimal driving field for multipartite quantum battery coupled with a common thermal bath |
| Z Q Yang(杨梓骞), L K Zhou(周立坤), Z Y Zhou(周正阳), G R Jin(金光日), L Cheng(程龙)†, and X G Wang(王晓光)‡ |
1 Physics Department, Zhejiang Sci-Tech University, Hangzhou 310018, China;
2 Zhejiang Institute of Modern Physics, Department of Physics, Zhejiang University, Hangzhou 310027, China |
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Abstract For a many-atom battery coupled with a common thermal bath, the useful energy is maximized at an optimal number of the atoms for a fixed harmonic driving field, i.e., the so-called optimal building block [see Chang et al. New J. Phys. 23 103026 (2021)]. Here we consider the useful energy defined by the ergotropy and a continuous-wave driving field. For the single-atom case, we present analytical results of the increased energy and the ergotropy in the long-time limit (i.e., the steady-state ergotropy). It is found that there exists an optimal value of the driving-field strength. Such an observation holds for many-atom cases. Numerically, we show that the optimal strength increases linearly with the number N of the atoms. Using the optimal strength for each N, both the increased energy and the ergotropy increase monotonically with N.
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Received: 27 April 2023
Revised: 05 June 2023
Accepted manuscript online: 07 June 2023
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PACS:
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03.65.-w
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(Quantum mechanics)
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05.70.-a
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(Thermodynamics)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 12075209, 11905185, and 11935012) and partially supported by the Science Foundation of Zhejiang Sci-Tech University (Grant No. 18062145-Y). |
Corresponding Authors:
L Cheng, X G Wang
E-mail: lcheng@zstu.edu.cn;xgwang@zju.edu.cn
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Cite this article:
Z Q Yang(杨梓骞), L K Zhou(周立坤), Z Y Zhou(周正阳), G R Jin(金光日), L Cheng(程龙), and X G Wang(王晓光) Optimal driving field for multipartite quantum battery coupled with a common thermal bath 2023 Chin. Phys. B 32 110301
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