Fig. 2: Static properties of the model.
From: Anomalous transport in U(1)-symmetric quantum circuits
a shows results for the averaged von Neumann entanglement entropy normalized by the Page value of ref. 65, along the Jz = π line and for various system sizes. Error bars represent standard deviations over at least 40 disorder realizations, selected with a 3.5× Interquartile Range86. Residual large fluctuations near the SWAP point arise from near-degeneracies in the Floquet spectrum. Panel b displays the phase diagram for the gap ratio obtained for N = 15 with values averaged over 10−20 trajectories. Results obtained with the POLFED eigensolver in fixed-M = 0 sector63 (see Sec. “POLFED” for numerical details).
