Fig. 1: Dynamic implementation of QEC.
a, A distance-5 surface code on a square lattice. The colours indicate the stabilizer Pauli flavour (red, X; blue, Z). b, Propagation rules for the Z-type detecting region. c, A Z-type detection region evolving through the circuit for the standard implementation, highlighting where Pauli errors that anti-commute will be detected. d, Time slices of the detecting region between gate layers of c. e, End-cycle (after measurement) time slices for four surface code implementations: standard, along with hexagonal, walking and iSWAP, which feature alternating end-cycle states.
