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Optimal work extraction from quantum states by photo-assisted Cooper pair tunneling

Lörch, Niels and Bruder, Christoph and Brunner, Nicolas and Hofer, Patrick P.. (2018) Optimal work extraction from quantum states by photo-assisted Cooper pair tunneling. Quantum Science and Technology, 3. 035014.

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Official URL: https://edoc.unibas.ch/68074/

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Abstract

The theory of quantum thermodynamics predicts fundamental bounds on work extraction from quantum states. As these bounds are derived in a very general and abstract setting, it is unclear how relevant they are in an experimental context, where control is typically limited. Here we address this question by showing that optimal work extraction is possible for a realistic engine. The latter consists of a superconducting circuit, where a LC-resonator is coupled to a Josephson junction. The oscillator state fuels the engine, providing energy absorbed by Cooper pairs, thus producing work in the form of an electrical current against an external voltage bias. We show that this machine can extract the maximal amount of work from all Gaussian and Fock states. Furthermore, we consider work extraction from a continuously stabilized oscillator state. In both scenarios, coherence between energy eigenstates is beneficial, increasing the power output of the machine. This is possible because the phase difference across the Josephson junction provides a phase reference.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Theoretische Physik (Bruder)
UniBasel Contributors:Bruder, Christoph and Lörch, Niels
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:IOP Publishing
e-ISSN:2058-9565
Note:Publication type according to Uni Basel Research Database: Journal article
Identification Number:
Last Modified:06 Feb 2019 14:53
Deposited On:06 Feb 2019 14:53

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