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Ancilla measurement-based quantum Otto engine using double-pair spin architecture.

S R Rathnakaran1, Asoka Biswas1

  • 1Indian Institute of Technology-Ropar, Department of Physics, Rupnagar, Punjab, India.

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Summary
This summary is machine-generated.

This study introduces a novel quantum-heat engine using a dual spin-pair architecture and a single heat bath. It achieves enhanced efficiency and power by replacing a cold bath with quantum measurements and correlations.

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Area of Science:

  • Quantum thermodynamics
  • Quantum information science
  • Condensed matter physics

Background:

  • Quantum heat engines offer a promising avenue for energy conversion at the nanoscale.
  • Traditional quantum heat engines often require two heat baths, limiting their practical implementation.
  • Quantum correlations and measurement protocols are increasingly explored to enhance quantum thermal machine performance.

Purpose of the Study:

  • To propose and analyze a novel quantum-heat engine model.
  • To investigate the role of a single heat bath and measurement protocols in engine operation.
  • To explore the enhancement of engine power and efficiency through quantum correlations and ancillary systems.

Main Methods:

  • Implementation of an Otto-like cycle using a dual spin-pair architecture.
  • Replacement of the conventional cold bath with a measurement protocol.
  • Utilizing an ancillary spin pair in a two-dimensional configuration to regulate performance.
  • Analysis of finite-time operation, power output, and efficiency.

Main Results:

  • The quantum-heat engine operates effectively with a single heat bath and a measurement protocol.
  • Finite power is achieved in finite time, enhanced by quantum correlations between spin pairs.
  • Engine efficiency surpasses the standard quantum Otto limit through local control of the ancillary pair.
  • Correlation between spin pairs allows for efficiency modulation via the measurement basis.

Conclusions:

  • Quantum resources, including spin correlations and projective measurements, are crucial for optimizing quantum thermal machines.
  • This model demonstrates a viable pathway for developing efficient quantum heat engines without requiring a second heat bath.
  • The proposed architecture offers a new paradigm for harnessing quantum phenomena in energy conversion devices.