Journal
PHYSICAL REVIEW LETTERS
Volume 105, Issue 23, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.105.237001
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Funding
- Dutch NanoNed program
- Dutch Organization for Fundamental Research (FOM)
- EU
- MICINN [FIS2009-10061, FIS2009-12773]
- CAM
- Spanish Grant [FPU AP2005-0720]
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We 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 approximate to 0.82 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.
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