The Energetic Cost of Work Extraction

Juliette Monsel, Marco Fellous-Asiani, Benjamin Huard, and Alexia Auffèves
Phys. Rev. Lett. 124, 130601 – Published 30 March 2020
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Abstract

We analyze work extraction from a qubit into a waveguide (WG) acting as a battery, where work is the coherent component of the energy radiated by the qubit. The process is stimulated by a wave packet whose mean photon number (the battery’s charge) can be adjusted. We show that the extracted work is bounded by the qubit’s ergotropy, and that the bound is saturated for a large enough battery’s charge. If this charge is small, work can still be extracted. Its amount is controlled by the quantum coherence initially injected in the qubit’s state, that appears as a key parameter when energetic resources are limited. This new and autonomous scenario for the study of quantum batteries can be implemented with state-of-the-art artificial qubits coupled to WGs.

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  • Received 1 July 2019
  • Revised 18 November 2019
  • Accepted 3 March 2020

DOI:https://doi.org/10.1103/PhysRevLett.124.130601

© 2020 American Physical Society

Physics Subject Headings (PhySH)

General PhysicsStatistical Physics & ThermodynamicsQuantum Information, Science & TechnologyAtomic, Molecular & OpticalCondensed Matter, Materials & Applied PhysicsInterdisciplinary Physics

Authors & Affiliations

Juliette Monsel1, Marco Fellous-Asiani1, Benjamin Huard2, and Alexia Auffèves1,*

  • 1Université Grenoble Alpes, CNRS, Grenoble INP, Institut Néel, 38000 Grenoble, France
  • 2Université de Lyon, ENS de Lyon, Université Claude Bernard, CNRS, Laboratoire de Physique, F-69342 Lyon, France

  • *alexia.auffeves@neel.cnrs.fr

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Issue

Vol. 124, Iss. 13 — 3 April 2020

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