David Byfield

Minimum Weight Decoding in the Colour Code is NP-hard All utility-scale quantum computers will require some form of Quantum Error Correction in which logical qubits are encoded in a larger number of physical qubits. One promising encoding is known as the...

Super nice result from my colleagues
@marklt.bsky.social @riverlane.com showing the NP-hard-ness of min-weight colour code decoding! scirate.com/arxiv/2603.0... 🧠

Spongebob destroys the folklore of qLDPC codes needing beyond square-grid hardware

In quantum bluesky fashion, here's a summary meme! @dulwichquantum.bsky.social

Thanks to my wonderful collaborators, Gyorgy Geher and Archibald Ruban @riverlane.com for the great project 3/3

We encode 4,6 and even 12 logical qubits using just 25-66% the physical qubit count of the RPC, all while having better logical performance.

We think these codes open exciting new directions for QEC code design and we hope they inspire even more new ideas 🧠

New paper! ✨ scirate.com/arxiv/2507.1... ✨

We present a new family of qLDPC codes that beat the rotated planar code while only requiring square-grid (or even hex-grid!) connectivity. 1/3

Got AMO qubits and love doing transversal gates, but don't know how to decode them efficiently and quickly? Check out this awesome new paper from my very talented colleagues @riverlane.com ! 🧪

Okay obligatory paper meme: Recently Setiawan, at Riverlane, and I released a preprint on how to tailor Floquet codes to noise that is biased towards, say, Z errors. This "X3Z3 Floquet code" could improve performance on architectures using, e.g. the heavy-hex lattice.
www.arxiv.org/abs/2411.04974