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Phys Rev Lett. 2010 Oct 1;105(14):140502. Epub 2010 Sep 27.

Strong coupling of a spin ensemble to a superconducting resonator.

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Quantronics group, SPEC (CNRS URA 2464), IRAMIS, DSM, CEA, 91191 Gif-sur-Yvette, France.


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 nitrogen-vacancy center electron spin resonance.

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