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We consider an approach to fault tolerant quantum computing based on a simpleerror detecting code operating as the substrate for a conventional surfacecode. We develop a customised decoder to process the information about thelikely location of errors, obtained from the error detect stage, with anadvanced variant of the minimum weight perfect matching algorithm. A thresholdgate-level error rate of 1.42% is found for the concatenated code given highlyasymmetric noise. This is superior to the standard surface code and remains soas we introduce a significant component of depolarising noise; specifically,until the latter is 70% the strength of the former. Moreover, given theasymmetric noise case, the threshold rises to 6.24% if we additionally assumethat local operations have 20 times higher fidelity than long range gates. Thusfor systems that are both modular and prone to asymmetric noise our codestructure can be very advantageous.

A high threshold code for modular hardware with asymmetric noise