Fig. 6: The exact iPEPS at the fixed point hx = hz = 0 of the toric code phase.
a The two rank-3 three tensors are defined to construct the tensor A. The tensor A for \(\left\vert {+}_{x}{+}_{y}\right\rangle\) and \(\left\vert {0}_{x}{0}_{y}\right\rangle\) has different virtual \({{\mathbb{Z}}}_{2}\) symmetry. iPEPS for b \(\left\vert {+}_{x}{+}_{y}\right\rangle\) and c \(\left\vert {0}_{x}{0}_{y}\right\rangle\) on a torus. The gray lines indicate the primal lattice.
