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-Institut
Technische Universitat Munchen
Nanosystems Initiative Munich (NIM)
E. Hoffmann
Walther-Meissner-Institut
Technische Universitat Munchen
M. Haeberlein
Walther-Meissner-Institut
Technische Universitat Munchen
M. J. Schwarz
Nanosystems Initiative Munich (NIM)
Walther-Meissner-Institut
Technische Universitat Munchen
P. Eder
Nanosystems Initiative Munich (NIM)
Walther-Meissner-Institut
Technische Universitat Munchen
J. Goetz
Walther-Meissner-Institut
Technische Universitat Munchen
F. Wulschner
Walther-Meissner-Institut
Technische Universitat Munchen
E. Xie
Technische Universitat Munchen
Walther-Meissner-Institut
L. Zhong
Walther-Meissner-Institut
Nanosystems Initiative Munich (NIM)
Technische Universitat Munchen
Isaac Fernando Quijandria Diaz
Chalmers, Microtechnology and Nanoscience (MC2), Applied Quantum Physics
D. Zueco
Universidad de Zaragoza
Fundación ARAID
J. J. G. Ripoll
CSIC - Instituto de Fisica Fundamental (IFF)
L. Garcia-Alvarez
Universidad del Pais Vasco - Euskal Herriko Unibertsitatea, Campus Bizkaia
G. Romero
Universidad de Santiago de Chile
Universidad del Pais Vasco - Euskal Herriko Unibertsitatea, Campus Bizkaia
E. Solano
Universidad del Pais Vasco - Euskal Herriko Unibertsitatea, Campus Bizkaia
Ikerbasque, the Basque Foundation for Science
K. G. Fedorov
Technische Universitat Munchen
Walther-Meissner-Institut
E. P. Menzel
Technische Universitat Munchen
Walther-Meissner-Institut
F. Deppe
Technische Universitat Munchen
Nanosystems Initiative Munich (NIM)
Walther-Meissner-Institut
A. Marx
Walther-Meissner-Institut
R. Gross
Technische Universitat Munchen
Walther-Meissner-Institut
Nanosystems Initiative Munich (NIM)
Physical Review B
24699950 (ISSN) 24699969 (eISSN)
Vol. 93 21 Art. no. 214501- 214501Quantum Propagating Microwaves in Strongly Coupled Environments (PROMISCE)
European Commission (FP7) (EC/FP7/284566), 2012-04-01 -- 2015-03-31.
Scalable Superconducting Processors for Entangled Quantum Information Technology (ScaleQIT)
European Commission (FP7) (EC/FP7/600927), 2013-02-01 -- 2016-01-31.
Subject Categories (SSIF 2011)
Atom and Molecular Physics and Optics
DOI
10.1103/PhysRevB.93.214501