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Spin Quantum Heat Engine Quantified by Quantum Steering.

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Quantum heat engines gain advantage from quantum correlations between the working medium and thermal bath, not just quantum coherence. This quantum steering reveals a true quantum Szilárd engine.

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Area of Science:

  • Quantum Information Science
  • Thermodynamics
  • Quantum Optics

Background:

  • Quantum heat engines are a growing area of research within quantum information science.
  • While quantum coherence's role is studied, the complete quantum advantage remains unclear.
  • Understanding quantum correlations is key to unlocking quantum heat engine potential.

Purpose of the Study:

  • To experimentally demonstrate the role of quantum correlation in quantum heat engine advantage.
  • To investigate if quantum correlations are essential, even when quantum coherence is excluded.
  • To quantify nonclassical correlations using quantum steering.

Main Methods:

  • Experimental demonstration of a quantum Szilárd engine.
  • Exclusion of quantum coherence in the working medium.
  • Quantification of nonclassical correlations via quantum steering.
  • Analysis of average work extraction.

Main Results:

  • Quantum correlation between the working medium and thermal bath is critical for quantum advantage.
  • Quantum advantage is achieved when the demon can truly steer the working medium.
  • Quantum coherence in the working medium is not necessary for this quantum advantage.

Conclusions:

  • Quantum correlation, specifically quantum steering, is the key to the quantum advantage of quantum Szilárd engines.
  • The demon's ability to steer the working medium signifies a true quantum engine.
  • Work extraction methods can verify the operation of a quantum Szilárd engine.