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
Nanosystems Initiative Munich (NIM)
Walther-Meissner-Institute for Low Temperature Research
Technical University of Munich
E. Hoffmann
Technical University of Munich
Walther-Meissner-Institute for Low Temperature Research
M. Haeberlein
Walther-Meissner-Institute for Low Temperature Research
Technical University of Munich
M. J. Schwarz
Walther-Meissner-Institute for Low Temperature Research
Technical University of Munich
Nanosystems Initiative Munich (NIM)
P. Eder
Technical University of Munich
Walther-Meissner-Institute for Low Temperature Research
Nanosystems Initiative Munich (NIM)
J. Goetz
Technical University of Munich
Walther-Meissner-Institute for Low Temperature Research
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)
Technical University of Munich
Walther-Meissner-Institute for Low Temperature Research
Isaac Fernando Quijandria Diaz
Chalmers, Microtechnology and Nanoscience (MC2), Applied Quantum Physics
D. Zueco
University of Zaragoza
Fundación ARAID
J. J. G. Ripoll
Spanish National Research Council (CSIC)
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
Basque Foundation for Science (Ikerbasque)
University of the Basque Country (UPV/EHU)
K. G. Fedorov
Technical University of Munich
Walther-Meissner-Institute for Low Temperature Research
E. P. Menzel
Technical University of Munich
Walther-Meissner-Institute for Low Temperature Research
F. Deppe
Walther-Meissner-Institute for Low Temperature Research
Technical University of Munich
Nanosystems Initiative Munich (NIM)
A. Marx
Walther-Meissner-Institute for Low Temperature Research
R. Gross
Nanosystems Initiative Munich (NIM)
Walther-Meissner-Institute for Low Temperature Research
Technical University of Munich
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 (SSIF 2011)
Atom and Molecular Physics and Optics
DOI
10.1103/PhysRevB.93.214501