American Physical Society, Physical Review Letters, 14(105), 2010
DOI: 10.1103/physrevlett.105.140502
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We report the realization of a quantum circuit in which an ensemble of electronic spins is coupled to a frequency tunable superconducting resonator. The spins are Nitrogen-Vacancy centers in a diamond crystal. The achievement of strong coupling is manifested by the appearance of a vacuum Rabi splitting in the transmission spectrum of the resonator when its frequency is tuned through the NV center electron spin resonance. ; Comment: 4 pages, 3 figures