2023/02/02 by Joshua Ramette, Josiah Sinclair, Ramette, Joshua +5 · 13 citations
Computer Science · #Quantum Computing Algorithms and Architecture #Quantum Information and Cryptography #Distributed systems and fault tolerance
paper · doi:10.48550/arxiv.2302.01296
One of the most promising routes towards scalable quantum computing is a modular approach. We show that distinct surface code patches can be connected in a fault-tolerant manner even in the presence of substantial noise along their connecting interface. We quantify analytically and numerically the combined effect of errors across the interface and bulk. We show that the system can tolerate 14 times higher noise at the interface compared to the bulk, with only a small effect on the code's threshold and sub-threshold behavior, reaching threshold with ∼ 1 % bulk errors and ∼ 10 % interface errors. This implies that fault-tolerant scaling of error-corrected modular devices is within reach using existing technology.