Daemonic ergotropy: Generalised measurements and multipartite settings

Fabian Bernards, Matthias Kleinmann, Otfried Gühne, Mauro Paternostro*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)
65 Downloads (Pure)


Recently, the concept of daemonic ergotropy has been introduced to quantify the maximum energy that can be obtained from a quantum system through an ancilla-assisted work extraction protocol based on information gain via projective measurements [G. Francica et al., npj Quant. Inf. 3, 12 (2018)]. We prove that quantum correlations are not advantageous over classical correlations if projective measurements are considered. We go beyond the limitations of the original definition to include generalised measurements and provide an example in which this allows for a higher daemonic ergotropy. Moreover, we propose a see-saw algorithm to find a measurement that attains the maximum work extraction. Finally, we provide a multipartite generalisation of daemonic ergotropy that pinpoints the influence of multipartite quantum correlations, and study it for multipartite entangled and classical states.

Original languageEnglish
Article number771
Number of pages16
Issue number8
Publication statusPublished - 07 Aug 2019


  • Ergotropy
  • Information thermodynamics
  • Quantum correlations

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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