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

Research output: Contribution to journalJournal article


  • Abdufarrukh A. Abdumalikov
  • Oleg Astafiev
  • Yasunobu Nakamura
  • Yuri A. Pashkin
  • JawShen Tsai
Article number180502
Journal publication date11/2008
JournalPhysical review b
Number of pages4
Original languageEnglish


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.