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Recent experiments by F. Yoshihara et al. [Phys. Rev. Lett. 97, 167001(2006)] and by K. Kakuyanagi et al. (cond-mat/0609564) provided information ondecoherence of the echo signal in Josephson-junction flux qubits at variousbias conditions. These results were interpreted assuming a Gaussian model forthe decoherence due to 1/f noise. Here we revisit this problem on the basis ofthe exactly solvable spin-fluctuator model reproducing detailed properties ofthe 1/f noise interacting with a qubit. We consider the time dependence of theecho signal and conclude that the results based on the Gaussian assumption needessential reconsideration.Comment: Improved fitting parameters, new figur

physical review. b, condensed matter and materials physics

Non-Gaussian dephasing in flux qubits due to<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mn>1</mml:mn><mml:mo>∕</mml:mo><mml:mi>f</mml:mi></mml:mrow></mml:math>noise

Non-Gaussian dephasing in flux qubits due to1∕fnoise