Approaching unit visibility for control of a superconducting qubit with dispersive readout |
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Authors: | Wallraff A Schuster D I Blais A Frunzio L Majer J Devoret M H Girvin S M Schoelkopf R J |
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Institution: | Department of Applied Physics, Yale University, New Haven, Connecticut 06520, USA. |
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Abstract: | 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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