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 language | English |
|---|---|
| Article number | 053824 |
| Journal | Physical Review A |
| Volume | 95 |
| Issue number | 5 |
| DOIs | |
| Publication status | Published - 9 May 2017 |
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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 journal › Article
}
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 -