Ultrastrong coupling in two-resonator circuit QED

Baust, A. ; Hoffmann, E. ; Haeberlein, M. ; Schwarz, M.J. ; Eder, P. ; Goetz, J. ; Wulschner, F. ; Xie, E. ; Zhong, L. ; Quijandría, F. ; Zueco, D. (Universidad de Zaragoza) ; Ripoll, J.J G. ; García-Álvarez, L. ; Romero, G. ; Solano, E. ; Fedorov, K.G. ; Menzel, E.P. ; Deppe, F. ; Marx, A. ; Gross, R.

Resumen: 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.

Idioma: Inglés

DOI: 10.1103/PhysRevB.93.214501

Año: 2016

Publicado en: Physical Review B. Condensed Matter and Materials Physics 93, 21 (2016), 214501 [8 pp]
ISSN: 1098-0121

Factor impacto JCR: 3.836 (2016)

Categ. JCR: PHYSICS, CONDENSED MATTER rank: 18 / 67 = 0.269 (2016) - Q2 - T1

Factor impacto SCIMAGO: 2.339 - Electronic, Optical and Magnetic Materials (Q1) - Condensed Matter Physics (Q1)

Financiación: info:eu-repo/grantAgreement/ES/MINECO/FIS2012-33022
Financiación: info:eu-repo/grantAgreement/ES/MINECO/FIS2012-36673-C03-02
Financiación: info:eu-repo/grantAgreement/ES/MINECO/FIS2014-55867-P
Financiación: info:eu-repo/grantAgreement/ES/MINECO/MAT2014-53432-C5

Tipo y forma: Article (PostPrint)

Área (Departamento): Área Física Materia Condensada (Dpto. Física Materia Condensa.)