M. Sohaib Alam, Jiajun Chen, Thomas R. Scruby (Apr 04 2025).
Abstract: We identify a period-4 measurement schedule for the checks of the Bacon-Shor code that fully covers spacetime with constant-weight detectors, and is numerically observed to provide the code with a threshold. Unlike previous approaches, our method does not rely on code concatenation and instead arises as the solution to a coloring game on a square grid. Under a uniform circuit-level noise model, we observe a threshold of approximately
0.3% when decoding with minimum weight perfect matching, and we conjecture that this could be improved using a more tailored decoder.
