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VOLUME 79 (2004) | ISSUE 12 | PAGE 783
Qubit decoherence by Gaussian low-frequency noise
PACS: 03.65.Yz, 03.67.Lx, 72.70.+m
Abstract
We have derived explicit non-perturbative expression for decoherence of quantum oscillations in a qubit by Gaussian low-frequency noise. Decoherence strength is controlled by the noise spectral density at zero frequency while the noise correlation time τ determines the time t of crossover from the 1/\sqrt{t} to the exponential suppression of coherence. We also performed Monte Carlo simulations of qubit dynamics with noise which agree with the analytical results.