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Energy cannot be extracted from entangled quantum systems under certain conditions. Researchers developed new methods to define and identify this "passivity," strengthening previous findings on quantum thermodynamics and temperature thresholds.

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Area of Science:

  • Quantum Thermodynamics
  • Quantum Information Theory
  • Condensed Matter Physics

Background:

  • Extracting energy from quantum systems is crucial for quantum technologies.
  • Entanglement in quantum systems is hypothesized to restrict energy extraction.
  • Understanding 'passivity' is key to defining limits on energy extraction.

Purpose of the Study:

  • To determine the conditions under which local energy extraction from bipartite quantum systems is impossible.
  • To fully characterize the concept of 'passivity' in the context of energy extraction.
  • To investigate the role of entanglement and strong coupling in limiting energy extraction.

Main Methods:

  • Utilized semidefinite programming techniques to establish necessary and sufficient conditions for energy extraction impossibility.
  • Developed novel methods for characterizing quantum passivity.
  • Analyzed thermal states in the thermodynamic limit with decaying spatial correlations.

Main Results:

  • Established precise conditions defining when local energy extraction is impossible in entangled bipartite quantum systems.
  • Significantly improved quantitative bounds on the threshold temperature for the onset of passivity.
  • Demonstrated the applicability of these findings to thermal states under specific correlation conditions.

Conclusions:

  • The study provides a complete characterization of passivity, revealing fundamental limits on energy extraction.
  • The application of semidefinite programming opens new avenues for exploring quantum thermodynamics.
  • Results offer crucial insights into the interplay between entanglement, temperature, and energy extractability in quantum systems.