Low-density parity-check applies restrictive quantum orthogonality condition to active error-correction rows; parent rows unconstrained

https://www.eurekalert.org/news-releases/1142982

"preserves both threshold behavior/ high minimum distance, retaining classical randomness/ structural optimization, protecting 4,612 logical- with 9,216 physical-qubits, reducing hardware overhead for scalable fault-tolerant quantum error correction... clear decoding waterfall alongside low frame 10^-8 error rate, <4% depolarizing noise... demonstrates that classical low-density parity-check design methodologies can effectively guide quantum error correction"