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Fast protocols for charging a three-spin-chain quantum battery.

Vasileios Evangelakos1, Emmanuel Paspalakis1, Dionisis Stefanatos2

  • 1Materials Science Department, School of Natural Sciences, University of Patras, 26504, Patras, Greece.

Scientific Reports
|November 27, 2025
PubMed
Summary
This summary is machine-generated.

Researchers developed fast charging protocols for quantum batteries using spin chains. Optimal strategies involve controlling amplitude and phase, with resonant excitation proving faster for strong coupling. This method can extend to larger quantum systems.

Keywords:
Optimal controlQuantum batteryQuantum chargingQuantum controlSpin chain

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Area of Science:

  • Quantum Information Science
  • Quantum Thermodynamics
  • Condensed Matter Physics

Background:

  • Quantum batteries offer faster charging than classical counterparts.
  • Efficient charging protocols are crucial for practical quantum battery applications.
  • Ising spin chains provide a tunable platform for quantum battery research.

Purpose of the Study:

  • To derive fast charging protocols for a three-qubit Ising spin-chain quantum battery.
  • To investigate the effects of weak and strong coupling on charging strategies.
  • To compare different charging methods, including subspace decomposition and resonant excitation.

Main Methods:

  • Utilized amplitude and phase control of a global transverse field.
  • Investigated weak coupling using spin-down ground state and strong coupling using Dicke states.
  • Employed analytical methods for weak coupling and pulse-sequence analysis (delta Bang pulses) for strong coupling, including resonant excitation and numerical optimal control.

Main Results:

  • For weak coupling, optimal charging involves maximum amplitude and time-varying phase.
  • For strong coupling, resonant excitation with delta Bang pulses achieves shorter charging times than non-resonant methods.
  • Numerical optimal control with finite amplitude bounds shows solutions similar to delta Bang pulses but with longer durations.

Conclusions:

  • Fast charging protocols for three-qubit Ising spin-chain quantum batteries have been successfully derived.
  • The developed methodology, particularly resonant excitation, offers significant improvements in charging speed.
  • The proposed techniques are extendable to larger spin-chain quantum batteries.