Fig. 1: Parity check matrix for an 8,4 linear block code. Fig. 2: Same parity check matrix shown as a Tanner graph. Each row is a parity check equation and generates an output based on a bit by bit ...

The FEC on a CD uses interleaving and layering. A short {32, 28} code is used to correct errors read from the track. Any it cannot correct are marked as erasures and the result is de-interleaved.

Researchers spent over a decade on this challenge, and today Photonic’s new paper, “ Computing Efficiently in QLDPC Codes,” is the first to demonstrate how to compute using SHYPS QLDPC codes.