Approaching Unit Visibility for Control of a Superconducting Qubit with Dispersive Readout

Details Approaching Unit Visibility for Control of a Superconducting Qubit with Dispersive Readout Approaching Unit Visibility for Control of a Superconducting Qubit with Dispersive Readout

2005-02-27

arxiv.org/abs/cond-mat/0502645v1

Phys. Rev. Lett. 95, 060501 (2005)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 5 figures, version with high resolution figures available at http://www.eng.yale.edu/rslab/Andreas/content/science/Pu

Scientific paper

10.1103/PhysRevLett.95.060501

In a Rabi oscillation experiment with a superconducting qubit we show that a visibility in the qubit excited state population of more than 90 % 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. The qubit coherence time is determined to be larger than 500 ns in a measurement of Ramsey fringes.

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