Ultrastrong coupling in two-resonator circuit QED
Journal article, 2016
We report on ultrastrong coupling between a superconducting flux qubit and a resonant mode of a system comprised of two superconducting coplanar stripline resonators coupled galvanically to the qubit. With a coupling strength as high as 17.5% of the mode frequency, exceeding that of previous circuit quantum electrodynamics experiments, we observe a pronounced Bloch-Siegert shift. The spectroscopic response of our multimode system reveals a clear breakdown of the Jaynes-Cummings approximation. In contrast to earlier experiments, the high coupling strength is achieved without making use of an additional inductance provided by a Josephson junction.
Author
A. Baust
Walther-Meissner-Institute for Low Temperature Research
Technical University of Munich
Nanosystems Initiative Munich (NIM)
E. Hoffmann
Walther-Meissner-Institute for Low Temperature Research
Technical University of Munich
M. Haeberlein
Walther-Meissner-Institute for Low Temperature Research
Technical University of Munich
M. J. Schwarz
Walther-Meissner-Institute for Low Temperature Research
Nanosystems Initiative Munich (NIM)
Technical University of Munich
P. Eder
Nanosystems Initiative Munich (NIM)
Walther-Meissner-Institute for Low Temperature Research
Technical University of Munich
J. Goetz
Walther-Meissner-Institute for Low Temperature Research
Technical University of Munich
F. Wulschner
Walther-Meissner-Institute for Low Temperature Research
Technical University of Munich
E. Xie
Walther-Meissner-Institute for Low Temperature Research
Technical University of Munich
L. Zhong
Nanosystems Initiative Munich (NIM)
Walther-Meissner-Institute for Low Temperature Research
Technical University of Munich
Isaac Fernando Quijandria Diaz
Chalmers, Microtechnology and Nanoscience (MC2), Applied Quantum Physics
D. Zueco
Fundación ARAID
University of Zaragoza
J. J. G. Ripoll
CSIC - Instituto de Fisica Fundamental (IFF)
L. Garcia-Alvarez
University of the Basque Country (UPV/EHU)
G. Romero
University of Santiago, Chile
University of the Basque Country (UPV/EHU)
E. Solano
University of the Basque Country (UPV/EHU)
Basque Foundation for Science (Ikerbasque)
K. G. Fedorov
Technical University of Munich
Walther-Meissner-Institute for Low Temperature Research
E. P. Menzel
Walther-Meissner-Institute for Low Temperature Research
Technical University of Munich
F. Deppe
Nanosystems Initiative Munich (NIM)
Walther-Meissner-Institute for Low Temperature Research
Technical University of Munich
A. Marx
Walther-Meissner-Institute for Low Temperature Research
R. Gross
Technical University of Munich
Walther-Meissner-Institute for Low Temperature Research
Nanosystems Initiative Munich (NIM)
Physical Review B
24699950 (ISSN) 24699969 (eISSN)
Vol. 93 21 Art. no. 214501- 214501Scalable Superconducting Processors for Entangled Quantum Information Technology (ScaleQIT)
European Commission (EC) (EC/FP7/600927), 2013-02-01 -- 2016-01-31.
Quantum Propagating Microwaves in Strongly Coupled Environments (PROMISCE)
European Commission (EC) (EC/FP7/284566), 2012-04-01 -- 2015-03-31.
Subject Categories
Atom and Molecular Physics and Optics
DOI
10.1103/PhysRevB.93.214501