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Published on: December 13, 2024

Singlet-like correlations: equal peak work, unequal robustness.

Karl Svozil1

  • 1Institute for Theoretical Physics, TU Wien, Wiedner Hauptstrasse 8-10/136, 1040 Vienna, Austria.

European Physical Journal Plus
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PubMed
Summary
This summary is machine-generated.

System-environment correlations offer a thermodynamic resource for work extraction. Quantum correlations demonstrate superior robustness against measurement misalignment compared to classical benchmarks, establishing a hierarchy of resource efficiency.

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Area of Science:

  • Thermodynamics
  • Quantum Information Theory
  • Statistical Mechanics

Background:

  • System-environment correlations are recognized as a crucial thermodynamic resource.
  • The erasure of these correlations enables the extraction of work.
  • Understanding the behavior of these correlations under various conditions is essential for quantum thermodynamics.

Purpose of the Study:

  • To compare the robustness of different correlation laws under measurement misalignment.
  • To establish a hierarchy of robustness for singlet-like, rotationally covariant correlation laws.
  • To investigate the operational value of classical and quantum correlations as thermodynamic resources.

Main Methods:

  • Comparison of three correlation laws: a local classical benchmark, the quantum cosine law, and a stronger-than-quantum step law.
  • Analysis under conditions of measurement misalignment.
  • Focus on the binary-outcome, uniform-marginal setting.

Main Results:

  • All three correlation laws can achieve the same peak extractable work (k B T ln 2) in the ideal case.
  • The quantum cosine law exhibits greater robustness to measurement misalignment than the classical benchmark.
  • The stronger-than-quantum step law shows remarkable robustness, remaining unaffected until a critical angle.

Conclusions:

  • Quantum correlations offer enhanced robustness as a thermodynamic resource compared to classical correlations.
  • A hierarchy of robustness exists among these correlation laws, with quantum laws generally outperforming classical ones.
  • The study clarifies the practical utility of different correlation types in real-world, imperfect measurement scenarios.