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Ultrastrong coupling in two-resonator circuit QED

A. Baust ; E. Hoffmann ; M. Haeberlein ; M. J. Schwarz ; P. Eder ; J. Goetz ; F. Wulschner ; E. Xie ; L. Zhong ; Fernando Quijandria (Institutionen för mikroteknologi och nanovetenskap, Tillämpad kvantfysik) ; D. Zueco ; J. J. G. Ripoll ; L. Garcia-Alvarez ; G. Romero ; E. Solano ; K. G. Fedorov ; E. P. Menzel ; F. Deppe ; A. Marx ; R. Gross
Physical Review B: covering condensed matter and materials physics (2469-9950). Vol. 93 (2016), 21, p. Art. no. 214501.
[Artikel, refereegranskad vetenskaplig]

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.

Denna post skapades 2016-07-06. Senast ändrad 2016-07-07.
CPL Pubid: 239046


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