Figure 4
From: RETRACTED ARTICLE: Noise tailoring for quantum circuits via unitary 2t-design
(a) Model of an original circuit that is arranged into cycles wherein each cycle consists of a round of the specified circuit and a round of the corresponding noise. (b) Model of a circuit wherein unitary operators chosen from the unitary 2t-design for the twirling of noise inserted at both ends of the corresponding noise of the gates.
