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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
PubMed
Summary
This summary is machine-generated.

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.

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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.