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Related Experiment Video

Updated: Nov 27, 2025

Measurement of Fronto-limbic Activity Using an Emotional Oddball Task in Children with Familial High Risk for Schizophrenia
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Daemonic Ergotropy: Generalised Measurements and Multipartite Settings.

Fabian Bernards1, Matthias Kleinmann1, Otfried Gühne1

  • 1Naturwissenschaftlich-Technische Fakultät, Universität Siegen, Walter-Flex-Straße 3, 57068 Siegen, Germany.

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|December 3, 2020
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Summary

Quantum correlations do not enhance energy extraction via projective measurements. Generalized measurements and a see-saw algorithm reveal potential for higher daemonic ergotropy, especially in multipartite systems.

Keywords:
ergotropyinformation thermodynamicsquantum correlations

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Area of Science:

  • Quantum thermodynamics
  • Quantum information theory
  • Quantum correlations

Background:

  • Daemonic ergotropy quantifies maximum energy from quantum systems via ancilla-assisted work extraction using projective measurements.
  • Previous work focused on projective measurements, limiting the scope of energy extraction analysis.

Purpose of the Study:

  • To investigate the role of quantum correlations in energy extraction beyond projective measurements.
  • To extend the concept of daemonic ergotropy to generalized measurements.
  • To develop a method for optimizing work extraction and explore multipartite systems.

Main Methods:

  • Theoretical analysis of quantum work extraction protocols.
  • Inclusion of generalized quantum measurements.
  • Development of a see-saw algorithm for measurement optimization.
  • Formulation of a generalized daemonic ergotropy for multipartite systems.

Main Results:

  • Quantum correlations offer no advantage over classical correlations for projective measurements.
  • Generalized measurements can lead to higher daemonic ergotropy than previously defined.
  • A see-saw algorithm effectively finds measurements for maximum work extraction.
  • A generalized daemonic ergotropy highlights the impact of multipartite quantum correlations.

Conclusions:

  • The advantage of quantum correlations in work extraction is measurement-dependent.
  • Generalized measurements unlock greater potential for energy extraction from quantum systems.
  • Multipartite quantum correlations play a crucial role in advanced work extraction protocols.