Broadband noise decoherence in solid-state complex architectures

Broadband noise represents a severe limitation toward the implementation of a solid-state quantum information processor. Considering common spectral forms, we propose a classification of noise sources based on the effects produced instead of their microscopic origin. We illustrate a multi-stage approach to broadband noise, which systematically includes only the relevant information on the environment, out of the huge parameterization needed for a microscopic description. We apply this technique to a solid-state two-qubit gate in a fixed coupling implementation scheme.