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Open Access item Time-resolved qubit readout via nonlinear Josephson inductance

Authors:Reuther, Georg M.
Zueco, David
Hänggi, Peter
Kohler, Sigmund
Issue Date:Sep-2011
Publisher:Institute of Physics Publishing
Citation:New Journal of Physics 13: 093022 (2011)
Abstract:We propose a generalization of dispersive qubit readout that provides the time evolution of a flux qubit observable. Our proposal relies on the nonlinear coupling of the qubit to a harmonic oscillator with high frequency, representing a dc superconducting quantum interference device. Information about the qubit dynamics is obtained by recording the oscillator response to resonant driving and subsequent lock-in detection. The measurement process is simulated for the example of coherent qubit oscillations. This corroborates the underlying measurement relation and also reveals that the measurement scheme possesses low backaction and high fidelity.
Description:19 páginas, 3 figuras.
Publisher version (URL):http://dx.doi.org/10.1088/1367-2630/13/9/093022
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