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Microwave quantum optics and electron transport through a metallic dot strongly coupled to a transmission line cavity

Bergenfeldt, Christian LU and Samuelsson, Peter LU (2012) In Physical Review B (Condensed Matter and Materials Physics) 85(4).
Abstract
We investigate theoretically the properties of the photon state and the electronic transport in a system consisting of a metallic quantum dot strongly coupled to a superconducting microwave transmission line cavity. Within the framework of circuit quantum electrodynamics, we derive a Hamiltonian for arbitrary strong capacitive coupling between the dot and the cavity. The dynamics of the system is described by a quantum master equation, accounting for the electronic transport as well as the coherent, nonequilibrium properties of the photon state. The photon state is investigated, focusing on, for a single active mode, signatures of microwave polaron formation and the effects of a nonequilibrium photon distribution. For two active photon... (More)
We investigate theoretically the properties of the photon state and the electronic transport in a system consisting of a metallic quantum dot strongly coupled to a superconducting microwave transmission line cavity. Within the framework of circuit quantum electrodynamics, we derive a Hamiltonian for arbitrary strong capacitive coupling between the dot and the cavity. The dynamics of the system is described by a quantum master equation, accounting for the electronic transport as well as the coherent, nonequilibrium properties of the photon state. The photon state is investigated, focusing on, for a single active mode, signatures of microwave polaron formation and the effects of a nonequilibrium photon distribution. For two active photon modes, the intermode conversion and polaron coherences are investigated. For the electronic transport, electrical current and noise through the dot and the influence of the photon state on the transport properties are at the focus. We identify clear transport signatures due to the nonequilibrium photon population, in particular the emergence of superpoissonian shot noise at ultrastrong dot-cavity couplings. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review B (Condensed Matter and Materials Physics)
volume
85
issue
4
publisher
American Physical Society
external identifiers
  • wos:000299892300003
  • scopus:84856449155
ISSN
1098-0121
DOI
10.1103/PhysRevB.85.045446
language
English
LU publication?
yes
id
23330911-605e-4cb8-a54a-0d514a204829 (old id 2416368)
date added to LUP
2012-03-28 10:07:43
date last changed
2017-08-06 04:22:11
@article{23330911-605e-4cb8-a54a-0d514a204829,
  abstract     = {We investigate theoretically the properties of the photon state and the electronic transport in a system consisting of a metallic quantum dot strongly coupled to a superconducting microwave transmission line cavity. Within the framework of circuit quantum electrodynamics, we derive a Hamiltonian for arbitrary strong capacitive coupling between the dot and the cavity. The dynamics of the system is described by a quantum master equation, accounting for the electronic transport as well as the coherent, nonequilibrium properties of the photon state. The photon state is investigated, focusing on, for a single active mode, signatures of microwave polaron formation and the effects of a nonequilibrium photon distribution. For two active photon modes, the intermode conversion and polaron coherences are investigated. For the electronic transport, electrical current and noise through the dot and the influence of the photon state on the transport properties are at the focus. We identify clear transport signatures due to the nonequilibrium photon population, in particular the emergence of superpoissonian shot noise at ultrastrong dot-cavity couplings.},
  articleno    = {045446},
  author       = {Bergenfeldt, Christian and Samuelsson, Peter},
  issn         = {1098-0121},
  language     = {eng},
  number       = {4},
  publisher    = {American Physical Society},
  series       = {Physical Review B (Condensed Matter and Materials Physics)},
  title        = {Microwave quantum optics and electron transport through a metallic dot strongly coupled to a transmission line cavity},
  url          = {http://dx.doi.org/10.1103/PhysRevB.85.045446},
  volume       = {85},
  year         = {2012},
}