Concatenating (3,4)-random hypergraph product codes with distance-5 rotated surface codes yields a lower logical error per qubit than a distance-25 rotated surface code when the top-code size parameter is at least 4.
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Hierarchical Quantum Error Correction with Hypergraph Product Code and Rotated Surface Code
Concatenating (3,4)-random hypergraph product codes with distance-5 rotated surface codes yields a lower logical error per qubit than a distance-25 rotated surface code when the top-code size parameter is at least 4.