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

Lörch, Niels; Bruder, Christoph; Brunner, Nicolas and Hofer, Patrick P. LU (2018) In Quantum Science and Technology 3(3).
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... (More)

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.

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Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
inelastic cooper pair tunneling, mesoscopic physics, quantum thermodynamics, resource theory, work extraction
in
Quantum Science and Technology
volume
3
issue
3
publisher
Institute of Physics Publishing
external identifiers
  • scopus:85049968723
DOI
10.1088/2058-9565/aacbf3
language
English
LU publication?
yes
id
e3ad8db1-5d2b-4081-9b81-836c7ca7fbda
date added to LUP
2018-08-02 13:26:10
date last changed
2019-02-10 05:07:25
@article{e3ad8db1-5d2b-4081-9b81-836c7ca7fbda,
  abstract     = {<p>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.</p>},
  articleno    = {035014},
  author       = {Lörch, Niels and Bruder, Christoph and Brunner, Nicolas and Hofer, Patrick P.},
  keyword      = {inelastic cooper pair tunneling,mesoscopic physics,quantum thermodynamics,resource theory,work extraction},
  language     = {eng},
  month        = {06},
  number       = {3},
  publisher    = {Institute of Physics Publishing},
  series       = {Quantum Science and Technology},
  title        = {Optimal work extraction from quantum states by photo-assisted Cooper pair tunneling},
  url          = {http://dx.doi.org/10.1088/2058-9565/aacbf3},
  volume       = {3},
  year         = {2018},
}