Fig. 2: Quartic interaction diagrams.
From: A universal framework for the quantum simulation of Yang–Mills theory
Panel (a) shows \({\hat{Z}}_{j,\overrightarrow{n}}{\hat{\bar{Z}}}_{j,\overrightarrow{n}}{\hat{Z}}_{j,\overrightarrow{n}}{\hat{\bar{Z}}}_{j,\overrightarrow{n}}\) and panel (b) shows \({\hat{Z}}_{j,\overrightarrow{n}}{\hat{\bar{Z}}}_{j,\overrightarrow{n}}{\hat{\bar{Z}}}_{j,\overrightarrow{n}-\hat{j}}{\hat{Z}}_{j,\overrightarrow{n}-\hat{j}}\). Red solid lines represent links in the lattice.
