期刊
PHYSICAL REVIEW B
卷 93, 期 21, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.93.214501
关键词
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资金
- German Research Foundation [SFB 631, FE 1564/1-1]
- Spanish MINECO [FIS2012-36673-03-02, MAT2014-53432-C5-1-R, FIS2014-55867-P, FIS2012-33022]
- CAM Research Network QUITEMAD+
- UPV/EHU [UFI 11/55]
- UPV/EHU PhD Grant
- Basque Government [IT472-10]
- Fondo Nacional de Desarrollo Cientifico y Tecnologico (FONDECYT, Chile) [1150653]
- EU
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.
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