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Giant-Atom Quantum Batteries: Lossless Energy Transfer via Interference Engineering.
Ke-Xiong Yan1,2, Yang Liu3, Yang Xiao1
1Fuzhou University, Fujian Key Laboratory of Quantum Information and Quantum Optics, College of Physics and Information Engineering, Fuzhou 350108, China.
Physical Review Letters
|May 22, 2026
Summary
We developed a novel charging protocol for quantum batteries (QBs) using giant atoms (GAs) to prevent energy loss. This method enables lossless energy transfer, enhancing QB performance and offering remote chiral charging capabilities.
Area of Science:
- Quantum Information Science
- Quantum Computing
- Condensed Matter Physics
Background:
- Quantum batteries (QBs) suffer irreversible energy loss due to environmentally induced decoherence during charging and discharging.
- Existing charging methods are susceptible to dissipation, limiting the efficiency and practicality of quantum energy storage.
Purpose of the Study:
- To propose and investigate a novel charging protocol for quantum batteries that overcomes decoherence-induced energy loss.
- To leverage the unique properties of giant atoms (GAs) and nonlocal coupling for efficient and lossless quantum energy transfer.
Main Methods:
- Implementation of both the QB and charger as superconducting giant atoms (GAs) with multiple coupling points to a shared microwave waveguide.
- Engineering a braided configuration of GAs to exploit spatially interleaved coupling paths for controlled energy transfer.
- Utilizing destructive interference to suppress waveguide-mediated dissipation while maintaining coherent charger-QB interactions.
Main Results:
- Demonstrated lossless energy transfer dynamics in the braided GA configuration, significantly outperforming separated and nested configurations.
- Successfully suppressed waveguide-mediated dissipation through engineered destructive interference.
- Proposed a long-range chiral charging protocol enabling unidirectional and reversible energy flow by modulating magnetic flux.
Conclusions:
- The proposed braided GA charging protocol offers a viable strategy for implementing decoherence-resistant quantum batteries.
- The developed methods provide guidelines for creating remote chiral quantum batteries in engineered circuits.
- This work advances the development of practical and efficient quantum energy storage solutions.
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