1/f Flux Noise in Josephson Phase Qubits

Details 1/f Flux Noise in Josephson Phase Qubits 1/f Flux Noise in Josephson Phase Qubits

2007-08-16

arxiv.org/abs/0708.2125v1

Physics

Condensed Matter

Superconductivity

4 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.99.187006

We present a new method to measure 1/f noise in Josephson quantum bits (qubits) that yields low-frequency spectra below 1Hz. Comparison of noise taken at positive and negative bias of a phase qubit shows the dominant noise source to be flux noise and not junction critical-current noise, with a magnitude similar to that measured previously in other systems. Theoretical calculations show that the level of flux noise is not compatible with the standard model of noise from two-level state defects in the surface oxides of the films.

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