Circuit QED with a Nonlinear Resonator : ac-Stark Shift and Dephasing

Autor:	Ong, F. R., Boissonneault, M., Mallet, F., Palacios-Laloy, A., Dewes, A., Doherty, A. C., Blais, A., Bertet, P., Vion, D., Esteve, D.
Rok vydání:	2010
Předmět:	Condensed Matter - Mesoscale and Nanoscale Physics Quantum Physics
Zdroj:	Phys. Rev. Lett. 106, 167002 (2011)
Druh dokumentu:	Working Paper
DOI:	10.1103/PhysRevLett.106.167002
Popis:	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. Comment: Paper : 4 pages, 3 figures; Supplementary material : 1 page, 1 figure
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/1010.6248 Zobrazit plný text záznamu View this record from Arxiv