Dephasing of qubits by transverse low-frequency noise |
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Authors: | Yu Makhlin A Shnirman |
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Institution: | 1.Institut für Theoretische Festk?rperphysic,Universit?t Karlsruhe,Karlsruhe,Germany;2.Landau Institute for Theoretical Physics,Russian Academy of Sciences,Moscow,Russia |
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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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