Circuit QED with a nonlinear resonator: ac-stark shift and dephasing

Ong, F. R., Boissonneault, M., Mallet, F., Palacios-Laloy, A., Dewes, A., Doherty, A. C., Blais, A., Bertet, P., Vion, D. and Esteve, D. (2011) Circuit QED with a nonlinear resonator: ac-stark shift and dephasing. Physical Review Letters, 106 16: . doi:10.1103/PhysRevLett.106.167002

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Author Ong, F. R.
Boissonneault, M.
Mallet, F.
Palacios-Laloy, A.
Dewes, A.
Doherty, A. C.
Blais, A.
Bertet, P.
Vion, D.
Esteve, D.
Title Circuit QED with a nonlinear resonator: ac-stark shift and dephasing
Journal name Physical Review Letters   Check publisher's open access policy
ISSN 0031-9007
1079-7114
Publication date 2011-04-22
Sub-type Article (original research)
DOI 10.1103/PhysRevLett.106.167002
Open Access Status File (Publisher version)
Volume 106
Issue 16
Total pages 4
Place of publication College Park, MD, United States
Publisher American Physical Society
Language eng
Abstract We have performed spectroscopic measurements of a superconducting qubit dispersively coupled to a nonlinear resonator driven by a pump microwave field. Measurements of the qubit frequency shift provide a sensitive probe of the intracavity field, yielding a precise characterization of the resonator nonlinearity. The qubit linewidth has a complex dependence on the pump frequency and amplitude, which is correlated with the gain of the nonlinear resonator operated as a small-signal amplifier. The corresponding dephasing rate is found to be close to the quantum limit in the low-gain limit of the amplifier.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ
Additional Notes Article number 167002

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Mathematics and Physics
 
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