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.
(Less)
- author
- Lörch, Niels
; Bruder, Christoph
; Brunner, Nicolas
and Hofer, Patrick P.
LU
- organization
- publishing date
- 2018-06-27
- 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
- article number
- 035014
- publisher
- IOP Publishing
- external identifiers
-
- scopus:85049968723
- ISSN
- 2058-9565
- 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
- 2023-11-17 22:38:07
@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>}},
author = {{Lörch, Niels and Bruder, Christoph and Brunner, Nicolas and Hofer, Patrick P.}},
issn = {{2058-9565}},
keywords = {{inelastic cooper pair tunneling; mesoscopic physics; quantum thermodynamics; resource theory; work extraction}},
language = {{eng}},
month = {{06}},
number = {{3}},
publisher = {{IOP 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}},
doi = {{10.1088/2058-9565/aacbf3}},
volume = {{3}},
year = {{2018}},
}