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Area of Science:

  • Quantum Physics
  • Condensed Matter Physics

Background:

  • Spin chains are promising for quantum technologies.
  • Quantum batteries offer efficient energy storage.

Purpose of the Study:

  • Investigate a one-dimensional dimerized XY chain as a spin quantum battery.
  • Analyze energy storage during a double quench protocol.
  • Explore the influence of charging timescales and quantum phase transitions.

Main Methods:

  • Mapping spins to auxiliary fermionic degrees of freedom.
  • Analyzing a double quench protocol for charging.
  • Investigating short-time, long-time, and thermodynamic limit regimes.
  • Analytical proof for quantum Ising chains.

Main Results:

  • Observed three distinct energy storage regimes based on charging timescale.
  • Energy stored is largely independent of charging parameters in the thermodynamic limit, especially when crossing quantum phase transitions.
  • Three-timescale behavior and phase diagram dependence confirmed in quantum Ising chains.

Conclusions:

  • The dimerized XY chain exhibits rich quantum phase diagram behavior relevant for quantum batteries.
  • Charging protocols crossing quantum phase transitions are crucial for stable energy storage.
  • Results provide a foundation for designing robust solid-state quantum batteries.