000056144 001__ 56144 000056144 005__ 20200221144210.0 000056144 0247_ $$2doi$$a10.1103/PhysRevB.93.214501 000056144 0248_ $$2sideral$$a95215 000056144 037__ $$aART-2016-95215 000056144 041__ $$aeng 000056144 100__ $$aBaust, A. 000056144 245__ $$aUltrastrong coupling in two-resonator circuit QED 000056144 260__ $$c2016 000056144 5060_ $$aAccess copy available to the general public$$fUnrestricted 000056144 5203_ $$aWe 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. 000056144 536__ $$9info:eu-repo/grantAgreement/ES/MINECO/MAT2014-53432-C5$$9info:eu-repo/grantAgreement/ES/MINECO/FIS2014-55867-P$$9info:eu-repo/grantAgreement/ES/MINECO/FIS2012-36673-C03-02$$9info:eu-repo/grantAgreement/ES/MINECO/FIS2012-33022 000056144 540__ $$9info:eu-repo/semantics/openAccess$$aby$$uhttp://creativecommons.org/licenses/by/3.0/es/ 000056144 590__ $$a3.836$$b2016 000056144 591__ $$aPHYSICS, CONDENSED MATTER$$b18 / 67 = 0.269$$c2016$$dQ2$$eT1 000056144 592__ $$a2.339$$b2016 000056144 593__ $$aElectronic, Optical and Magnetic Materials$$c2016$$dQ1 000056144 593__ $$aCondensed Matter Physics$$c2016$$dQ1 000056144 655_4 $$ainfo:eu-repo/semantics/article$$vinfo:eu-repo/semantics/acceptedVersion 000056144 700__ $$aHoffmann, E. 000056144 700__ $$aHaeberlein, M. 000056144 700__ $$aSchwarz, M.J. 000056144 700__ $$aEder, P. 000056144 700__ $$aGoetz, J. 000056144 700__ $$aWulschner, F. 000056144 700__ $$aXie, E. 000056144 700__ $$aZhong, L. 000056144 700__ $$aQuijandría, F. 000056144 700__ $$0(orcid)0000-0003-4478-1948$$aZueco, D.$$uUniversidad de Zaragoza 000056144 700__ $$aRipoll, J.J G. 000056144 700__ $$aGarcía-Álvarez, L. 000056144 700__ $$aRomero, G. 000056144 700__ $$aSolano, E. 000056144 700__ $$aFedorov, K.G. 000056144 700__ $$aMenzel, E.P. 000056144 700__ $$aDeppe, F. 000056144 700__ $$aMarx, A. 000056144 700__ $$aGross, R. 000056144 7102_ $$12003$$2395$$aUniversidad de Zaragoza$$bDpto. Física Materia Condensa.$$cÁrea Física Materia Condensada 000056144 773__ $$g93, 21 (2016), 214501 [8 pp]$$pPhys. Rev. B, Condens. matter mater. phys.$$tPhysical Review B. Condensed Matter and Materials Physics$$x1098-0121 000056144 8564_ $$s687628$$uhttps://zaguan.unizar.es/record/56144/files/texto_completo.pdf$$yPostprint 000056144 8564_ $$s60963$$uhttps://zaguan.unizar.es/record/56144/files/texto_completo.jpg?subformat=icon$$xicon$$yPostprint 000056144 909CO $$ooai:zaguan.unizar.es:56144$$particulos$$pdriver 000056144 951__ $$a2020-02-21-13:11:34 000056144 980__ $$aARTICLE