Non-Gaussian dephasing in flux qubits due to 1/f-noise

Details Non-Gaussian dephasing in flux qubits due to 1/f-noise Non-Gaussian dephasing in flux qubits due to 1/f-noise

2006-12-26

arxiv.org/abs/cond-mat/0612637v2

Phys. Rev. B 76, 064531 (2007).

Physics

Condensed Matter

Superconductivity

Improved fitting parameters, new figure

Scientific paper

10.1103/PhysRevB.76.064531

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

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