Approaching unit visibility for control of a superconducting qubit with dispersive readout.

@article{Wallraff2005ApproachingUV,
  title={Approaching unit visibility for control of a superconducting qubit with dispersive readout.},
  author={Andreas Wallraff and David I. Schuster and Alexandre Blais and Luigi Frunzio and Johannes Majer and Michel H. Devoret and Steven M. Girvin and R. J. Schoelkopf},
  journal={Physical review letters},
  year={2005},
  volume={95 6},
  pages={060501}
}
In a Rabi oscillation experiment with a superconducting qubit we show that a visibility in the qubit excited state population of more than 95% can be attained. We perform a dispersive measurement of the qubit state by coupling the qubit non-resonantly to a transmission line resonator and probing the resonator transmission spectrum. The measurement process is well characterized and quantitatively understood. In a measurement of Ramsey fringes, the qubit coherence time is larger than 500 ns. 
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