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Single-Ion Information Engine for Charging Quantum Battery.

Jialiang Zhang1,2, Pengfei Wang3, Wentao Chen1

  • 1Tsinghua University, State Key Laboratory of Low Dimensional Quantum Physics, Department of Physics, Beijing 100084, China.

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Researchers demonstrated a quantum battery using trapped ions to store mechanical work from an information engine. This breakthrough achieved high energy conversion efficiency, paving the way for microscopic quantum engines.

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Area of Science:

  • Quantum physics
  • Thermodynamics
  • Nanotechnology

Background:

  • Information engines convert measurement and control into mechanical work.
  • Storing this work efficiently is a key challenge for information engines.
  • Trapped ions offer a potential platform for microscopic information engines.

Purpose of the Study:

  • To experimentally demonstrate a quantum battery using quantized mechanical motion.
  • To charge this quantum battery using a single trapped-ion information engine.
  • To investigate the efficiency of information-to-work conversion in this system.

Main Methods:

  • Utilized a single trapped-ion information engine to repeatedly charge a quantum battery.
  • Employed rapid state discrimination to minimize measurement-induced disturbances.
  • Quantized mechanical motion served as the quantum battery.

Main Results:

  • Achieved information-to-ergotropy conversion efficiency near 67% of the theoretical limit.
  • Reached a maximum information-to-work conversion efficiency of 70%.
  • Demonstrated successful charging of the quantum battery via repeated cycles.

Conclusions:

  • Trapped ions are a viable platform for microscopic information engines.
  • The developed method enables efficient storage of work generated by information engines.
  • This approach holds potential for future scaled-up quantum technologies.