Vacuum Rabi splitting due to strong coupling of a flux qubit and a coplanar-waveguide resonator

Abdufarrukh A. Abdumalikov, Oleg Astafiev, Yasunobu Nakamura, Yuri A. Pashkin, Jaw Shen Tsai

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115 Citations (Scopus)

Abstract

We have experimentally studied a superconducting flux qubit strongly coupled to a single mode of a high-quality transmission-type coplanar-waveguide resonator. The qubit-resonator coupling is revealed in the resonator transmission spectrum as a vacuum Rabi splitting. In the dispersive regime the qubit energy levels are spectroscopically probed. We observe a shift in the qubit transition frequency that linearly depends on the number of photons in the resonator, which is attributed to the ac-Zeeman shift. The observations are in agreement with the theoretical predictions.

Original languageEnglish
Article number180502
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume78
Issue number18
DOIs
Publication statusPublished - 10 Nov 2008
Externally publishedYes

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