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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.


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