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

Technical University of Munich

Nanosystems Initiative Munich (NIM)

E. Hoffmann

Walther-Meissner-Institut

Technical University of Munich

M. Haeberlein

Walther-Meissner-Institut

Technical University of Munich

M. J. Schwarz

Walther-Meissner-Institut

Nanosystems Initiative Munich (NIM)

Technical University of Munich

P. Eder

Nanosystems Initiative Munich (NIM)

Walther-Meissner-Institut

Technical University of Munich

J. Goetz

Walther-Meissner-Institut

Technical University of Munich

F. Wulschner

Walther-Meissner-Institut

Technical University of Munich

E. Xie

Walther-Meissner-Institut

Technical University of Munich

L. Zhong

Nanosystems Initiative Munich (NIM)

Walther-Meissner-Institut

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-Institut

E. P. Menzel

Walther-Meissner-Institut

Technical University of Munich

F. Deppe

Nanosystems Initiative Munich (NIM)

Walther-Meissner-Institut

Technical University of Munich

A. Marx

Walther-Meissner-Institut

R. Gross

Technical University of Munich

Walther-Meissner-Institut

Nanosystems Initiative Munich (NIM)

Physical Review B

24699950 (ISSN) 24699969 (eISSN)

Vol. 93 21 Art. no. 214501- 214501

Scalable Superconducting Processors for Entangled Quantum Information Technology (ScaleQIT)

European Commission (FP7), 2013-02-01 -- 2016-01-31.

Quantum Propagating Microwaves in Strongly Coupled Environments (PROMISCE)

European Commission (FP7), 2012-04-01 -- 2015-03-31.

Subject Categories

Atom and Molecular Physics and Optics

DOI

10.1103/PhysRevB.93.214501

More information

Latest update

11/22/2018