Time-resolved qubit readout via nonlinear Josephson inductance

Details Time-resolved qubit readout via nonlinear Josephson inductance Time-resolved qubit readout via nonlinear Josephson inductance

2011-05-05

arxiv.org/abs/1105.1105v2

New J. Phys. 13, 093022 (2011)

Physics

Condensed Matter

Superconductivity

16 pages, 3 figures

Scientific paper

10.1088/1367-2630/13/9/093022

We propose a generalisation of dispersive qubit readout which provides the time evolution of a flux qubit observable. Our proposal relies on the non-linear coupling of the qubit to a harmonic oscillator with high frequency, representing a dc-SQUID. 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.

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