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

2005/02/27 by A. Wallraff, D. I. Schuster, A. Blais +4 · 2 citations
Physics and Astronomy · #cond-mat.mes-hall #cond-mat.supr-con #quant-ph

paper · pdf · doi:10.1103/physrevlett.95.060501

published as Phys. Rev. Lett. 95, 060501 (2005) · 4 pages, 5 figures, version with high resolution figures available at http://www.eng.yale.edu/rslab/Andreas/content/science/PubsPapers.html

arxiv created 2005/02/27 · arxiv updated 2009/12/01

Abstract

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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• Co-designed reflective and leaky-waveguide low-pass filter for superconducting circuits
• High-power readout of a transmon qubit using a nonlinear coupling

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