Characteristic spectra of circuit quantum electrodynamics systems from the ultrastrong- to the deep-strong-coupling regime

F. Yoshihara, T. Fuse, Sahel Ashhab, K. Kakuyanagi, S. Saito, K. Semba

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

We report on spectra of circuit-quantum-electrodynamics (QED) systems in an intermediate regime that lies between the ultrastrong- and the deep-strong-coupling regimes, which have been reported previously in the literature. Our experimental results, along with numerical simulations, demonstrate that as the coupling strength increases, the spectrum of a circuit-QED system undergoes multiple qualitative transformations, such that several coupling regimes are identified, each with its own unique spectral features. The different spectral transformations can be related to crossings between energy level differences and to changes in the symmetries of the energy eigenstates. These results allow us to use qualitative spectral features to infer certain properties and parameters of the system.

Original languageEnglish
Article number053824
JournalPhysical Review A
Volume95
Issue number5
DOIs
Publication statusPublished - 9 May 2017

Fingerprint

quantum electrodynamics
eigenvectors
energy levels
symmetry
simulation
energy

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Cite this

Characteristic spectra of circuit quantum electrodynamics systems from the ultrastrong- to the deep-strong-coupling regime. / Yoshihara, F.; Fuse, T.; Ashhab, Sahel; Kakuyanagi, K.; Saito, S.; Semba, K.

In: Physical Review A, Vol. 95, No. 5, 053824, 09.05.2017.

Research output: Contribution to journalArticle

@article{a5d626017ce34945a642e09f29582de1,
title = "Characteristic spectra of circuit quantum electrodynamics systems from the ultrastrong- to the deep-strong-coupling regime",
abstract = "We report on spectra of circuit-quantum-electrodynamics (QED) systems in an intermediate regime that lies between the ultrastrong- and the deep-strong-coupling regimes, which have been reported previously in the literature. Our experimental results, along with numerical simulations, demonstrate that as the coupling strength increases, the spectrum of a circuit-QED system undergoes multiple qualitative transformations, such that several coupling regimes are identified, each with its own unique spectral features. The different spectral transformations can be related to crossings between energy level differences and to changes in the symmetries of the energy eigenstates. These results allow us to use qualitative spectral features to infer certain properties and parameters of the system.",
author = "F. Yoshihara and T. Fuse and Sahel Ashhab and K. Kakuyanagi and S. Saito and K. Semba",
year = "2017",
month = "5",
day = "9",
doi = "10.1103/PhysRevA.95.053824",
language = "English",
volume = "95",
journal = "Physical Review A - Atomic, Molecular, and Optical Physics",
issn = "1050-2947",
publisher = "American Physical Society",
number = "5",

}

TY - JOUR

T1 - Characteristic spectra of circuit quantum electrodynamics systems from the ultrastrong- to the deep-strong-coupling regime

AU - Yoshihara, F.

AU - Fuse, T.

AU - Ashhab, Sahel

AU - Kakuyanagi, K.

AU - Saito, S.

AU - Semba, K.

PY - 2017/5/9

Y1 - 2017/5/9

N2 - We report on spectra of circuit-quantum-electrodynamics (QED) systems in an intermediate regime that lies between the ultrastrong- and the deep-strong-coupling regimes, which have been reported previously in the literature. Our experimental results, along with numerical simulations, demonstrate that as the coupling strength increases, the spectrum of a circuit-QED system undergoes multiple qualitative transformations, such that several coupling regimes are identified, each with its own unique spectral features. The different spectral transformations can be related to crossings between energy level differences and to changes in the symmetries of the energy eigenstates. These results allow us to use qualitative spectral features to infer certain properties and parameters of the system.

AB - We report on spectra of circuit-quantum-electrodynamics (QED) systems in an intermediate regime that lies between the ultrastrong- and the deep-strong-coupling regimes, which have been reported previously in the literature. Our experimental results, along with numerical simulations, demonstrate that as the coupling strength increases, the spectrum of a circuit-QED system undergoes multiple qualitative transformations, such that several coupling regimes are identified, each with its own unique spectral features. The different spectral transformations can be related to crossings between energy level differences and to changes in the symmetries of the energy eigenstates. These results allow us to use qualitative spectral features to infer certain properties and parameters of the system.

UR - http://www.scopus.com/inward/record.url?scp=85023752102&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85023752102&partnerID=8YFLogxK

U2 - 10.1103/PhysRevA.95.053824

DO - 10.1103/PhysRevA.95.053824

M3 - Article

VL - 95

JO - Physical Review A - Atomic, Molecular, and Optical Physics

JF - Physical Review A - Atomic, Molecular, and Optical Physics

SN - 1050-2947

IS - 5

M1 - 053824

ER -