| Issue |
EPL
Volume 131, Number 4, August 2020
|
|
|---|---|---|
| Article Number | 43001 | |
| Number of page(s) | 6 | |
| Section | Atomic, Molecular and Optical Physics | |
| DOI | https://doi.org/10.1209/0295-5075/131/43001 | |
| Published online | 01 September 2020 | |
Closed-loop three-level charged quantum battery
College of Physics and Electronic Engineering, Northwest Normal University -Lanzhou, 730070, China
Received: 14 May 2020
Accepted: 29 July 2020
Quantum batteries are energy storage or extraction devices in a quantum system. Here, we present a closed-loop quantum battery by utilizing a circularly coupled three-state quantum system, and investigate its charging dynamics. The charging performance is greatly improved due to the existence of the third field in the system to form a closed-contour interaction. Through appropriately selecting the third control field, the maximum average power can be increased, even far beyond the ideal maximum power value of non-closed-loop three-level quantum battery. We study the effect of the global driving-field phase on the charging process and find that both the maximum extractable work (“ergotropy”) and the charging power vary periodically under different control fields, with a period of 
. Possible experimental implementation in nitrogen-vacancy spin is discussed as well.
PACS: 32.80.Qk – Coherent control of atomic interactions with photons / 42.50.Dv – Quantum state engineering and measurements / 03.65.-w – Quantum mechanics
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