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VOLUME 78 | ISSUE 8 | PAGE 969 Dephasing of qubits by transverse low-frequency noise Yu. Makhlin+,* and A. Shnirman+ +Institut für Theoretische Festkörperphysik, Universität Karlsruhe, D-76128 Karlsruhe, Germany *L. D. Landau Institute for Theoretical Physics RAS, 117940 Moscow, Russia PACS: 03.65.Yz, 75.10.Jm, 85.25.Cp Abstract We analyze the dissipative dynamics of a two-level quantum system subject to low-frequency, e.g. 1/f noise, motivated by recent experiments with superconducting quantum circuits. We show that the effect of transverse linear coupling of the system to low-frequency noise is equivalent to that of quadratic longitudinal coupling. We further find the decay law of quantum coherent oscillations under the influence of both low- and high-frequency fluctuations, in particular, for the case of comparable rates of relaxation and pure dephasing. Download PS file (GZipped, 109.1K)  |  Download PDF file (196.4K)