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Simple scheme for extracting work with a single bath.

Nicolò Piccione1, Benedetto Militello2,3, Anna Napoli2,3

  • 1Institut UTINAM, CNRS UMR 6213, Université Bourgogne Franche-Comté, Observatoire des Sciences de l'Univers THETA, 41 bis avenue de l'Observatoire, F-25010 Besançon, France.

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Summary
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This study introduces a simple protocol to extract work from a quantum system using thermalization. The method achieves significant work extraction, comparable to system energies, particularly at finite temperatures.

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Area of Science:

  • Quantum thermodynamics
  • Statistical mechanics
  • Quantum information science

Background:

  • Work extraction from quantum systems is crucial for quantum technologies.
  • Existing methods often require complex setups or specific conditions.
  • A simplified approach using thermalization is explored.

Purpose of the Study:

  • To propose and analyze a simple work extraction protocol.
  • To quantify extracted work and efficiency bounds.
  • To demonstrate the protocol's applicability to specific quantum models.

Main Methods:

  • Exploiting the thermalization of a storage bipartite system (S) coupled to a resource system (R).
  • Utilizing a work definition based on a single bath.
  • Applying the protocol to interacting qubits and the Rabi model.

Main Results:

  • Quantified extracted work and ideal efficiency with maximum bounds.
  • Achieved work extraction comparable to subsystem energies in strong coupling regimes.
  • Observed peak work extraction at finite bath temperatures (T).
  • Demonstrated work transfer to an external device in the Rabi model at T=0 for cyclic implementation.

Conclusions:

  • The proposed protocol offers a straightforward method for quantum work extraction.
  • The protocol is effective even with strong system-environment couplings.
  • Finite temperatures are optimal for peak work extraction, and cyclic operation is feasible.