In recent years, there is a surging amount of works on qLDPC codes achieving linear/almost linear distance. A lot of them are based on fancy products of expander codes. However, it seems like this is yet far from practical. My question is, classical expander code is also very good, why is there no practical applications of them? Why are the reasons people use other LDPC codes instead? Why is it only of theoretical interest, e.g. proving PCP?
Do we face the same issues with quantum LDPC codes based on expander codes? (I know for sure, in quantum computing, we also need to consider logical gates. But what about other aspects?)
