Dephasing due to nonstationary 1/f noise

Details Dephasing due to nonstationary 1/f noise Dephasing due to nonstationary 1/f noise

2004-04-27

arxiv.org/abs/cond-mat/0404641v1

In: Quantum informarion and decoherence in nanosystems, pp. 287-290. Eds. D.C. Glattli, M. Sanquer, and J. Tran Thanh Van, The

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 2 figures, to be published in the proceedings of the Vth Rencontres de Moriond in Mesoscopic Physics

Scientific paper

Motivated by recent experiments with Josephson qubits we propose a new phenomenological model for 1/f noise due to collective excitations of interacting defects in the qubit's environment. At very low temperatures the effective dynamics of these collective modes are very slow leading to pronounced non-Gaussian features and nonstationarity of the noise. We analyze the influence of this noise on the dynamics of a qubit in various regimes and at different operation points. Remarkable predictions are absolute time dependences of a critical coupling and of dephasing in the strong coupling regime.

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