Structured environments in solid state systems: crossover from Gaussian to non-Gaussian behavior

Details Structured environments in solid state systems: crossover from Gaussian to non-Gaussian behavior Structured environments in solid state systems: crossover from Gaussian to non-Gaussian behavior

2008-01-28

arxiv.org/abs/0801.4331v1

Physica E 40, 198 - 205 (2007)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

8 pages, 9 figures. Proceedings of the DECONS '06 Conference

Scientific paper

10.1016/j.physe.2007.05.002

The variety of noise sources typical of the solid state represents the main limitation toward the realization of controllable and reliable quantum nanocircuits, as those allowing quantum computation. Such ``structured environments'' are characterized by a non-monotonous noise spectrum sometimes showing resonances at selected frequencies. Here we focus on a prototype structured environment model: a two-state impurity linearly coupled to a dissipative harmonic bath. We identify the time scale separating Gaussian and non-Gaussian dynamical regimes of the Spin-Boson impurity. By using a path-integral approach we show that a qubit interacting with such a structured bath may probe the variety of environmental dynamical regimes.

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