Phys. Rev. Lett. 95, 060501 (2005) [4 pages]Approaching Unit Visibility for Control of a Superconducting Qubit with Dispersive ReadoutReceived 27 February 2005; published 1 August 2005 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 nonresonantly 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. © 2005 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.95.060501
DOI:
10.1103/PhysRevLett.95.060501
PACS:
03.67.Pp, 42.50.Pq, 85.35.Gv
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