Dephasing of qubits by transverse low-frequency noise
Yu. Makhlin, Alexander Shnirman · Journal of Experimental and Theoretical Physics Letters · 2003
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.