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The Energetic Cost of Work Extraction.
Juliette Monsel1, Marco Fellous-Asiani1, Benjamin Huard2
1Université Grenoble Alpes, CNRS, Grenoble INP, Institut Néel, 38000 Grenoble, France.
Physical Review Letters
|April 18, 2020
Summary
We demonstrate work extraction from a qubit into a waveguide quantum battery. Extracted work depends on the battery
Area of Science:
- Quantum physics
- Quantum information science
- Quantum thermodynamics
Background:
- Quantum batteries offer a novel approach to energy storage.
- Work extraction from quantum systems is crucial for their practical application.
- Understanding the role of quantum coherence in energy transfer is essential.
Purpose of the Study:
- To analyze work extraction from a qubit into a waveguide acting as a quantum battery.
- To investigate the influence of battery charge and quantum coherence on extracted work.
- To establish the relationship between extracted work and the qubit's ergotropy.
Main Methods:
- Theoretical analysis of a qubit-waveguide system.
- Stimulation of work extraction using a wave packet.
- Mathematical derivation of work bounds and saturation conditions.
Main Results:
- Extracted work is fundamentally limited by the qubit's ergotropy.
- This ergotropy bound can be fully saturated with a sufficiently large battery charge.
- Quantum coherence in the qubit's initial state plays a critical role in work extraction, especially for limited battery charge.
Conclusions:
- A novel autonomous quantum battery scenario is proposed and analyzed.
- The findings highlight the importance of quantum coherence as a resource in quantum energy transfer.
- The proposed system is experimentally feasible using state-of-the-art artificial qubits coupled to waveguides.
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