Daniel Leonforte

A p-bit parallel-tempering decoder in single-flux-quantum logic: simulated surface-code decoding below MWPM at 4 K

We describe a decoder for the rotated surface code that runs as parallel tempering on probabilistic bits (p-bits) built from single-flux-quantum (SFQ) cells at 4.2 K. The X graph is decoded first, and its result switches the weights of the Z graph to account for X–Z correlations...