The Energetic Cost of Work Extraction

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 wor...

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Bibliographic Details
Published in:Physical review letters 2020-04, Vol.124 (13), p.130601-130601, Article 130601
Main Authors: Monsel, Juliette, Fellous-Asiani, Marco, Huard, Benjamin, Auffèves, Alexia
Format: Article
Language:English
Subjects:
Coherence
Cost analysis
Physics
Quantum phenomena
Quantum Physics
Qubits (quantum computing)
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Summary: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.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.124.130601