arXiv:2312.04522quant-ph
Yoked surface codes
Early discovery. Linked by one identifiable commenter. This paper is outside the main ranking; a mention is not an endorsement.
Abstract
We nearly triple the number of logical qubits per physical qubit of surface codes in the teraquop regime by concatenating them into high-density parity check codes. These "yoked surface codes" are arrayed in a rectangular grid, with parity checks (yokes) measured along each row, and optionally along each column, using lattice surgery. Our construction assumes no additional connectivity beyond a nearest neighbor square qubit grid operating at a physical error rate of $10^{-3}$.
Overall this article looks pretty good. There was one major numerical error I noticed, but then the article corrected itself at the end. This was the error: > With an error rate of 1% the surface error correction code requires ~ 500 physical qubits required to encode one logical…
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