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Observation of the Bloch-Siegert Shift in a Qubit-Oscillator System in the Ultrastrong Coupling Regime

AuthorsForn-Díaz, Pol; Lisenfeld, P.; Marcos, David ; García-Ripoll, Juan José ; Solano, Enrique; Harmans, C. J. P. M; Mooij, H.
Issue Date30-Nov-2010
AbstractWe measure the dispersive energy-level shift of an $LC$ resonator magnetically coupled to a superconducting qubit, which clearly shows that our system operates in the ultrastrong coupling regime. The large mutual kinetic inductance provides a coupling energy of $\approx0.82$~GHz, requiring the addition of counter-rotating-wave terms in the description of the Jaynes-Cummings model. We find a 50~MHz Bloch-Siegert shift when the qubit is in its symmetry point, fully consistent with our analytical model.
Publisher version (URL)http://dx.doi.org/10.1103/PhysRevLett.105.237001
Appears in Collections:(CFMAC-IFF) Artículos
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