Constant-Overhead Fault-Tolerant Bell-Pair Distillation Using High-Rate Codes

作者：J. Pablo Bonilla Ataides, Hengyun Zhou, Qian Xu, Gefen Baranes, Bikun Li, Mikhail D. Lukin, Liang Jiang · 发表于：Physical Review Letters · 年份：2025 · DOI：10.1103/s39k-r2kq · 被引用次数：17 · 研究领域：Quantum Computing Algorithms and Architecture、Quantum Information and Cryptography、Quantum-Dot Cellular Automata

We present a fault-tolerant Bell-pair distillation scheme achieving constant overhead through high-rate quantum low-density parity-check (qLDPC) codes. Our approach maintains a constant distillation rate equal to the code rate while requiring no additional overhead beyond the physical qubits of the code. Full circuit-level analysis demonstrates fault-tolerance for input Bell-pair infidelities below a threshold ∼10%, readily achievable with near-term capabilities. Unlike previous proposals, our scheme keeps the output Bell pairs encoded in qLDPC codes at each node, eliminating unencoding overhead and enabling direct use in distributed quantum applications through recent advances in qLDPC computation. These results establish qLDPC-based distillation as a practical route toward resource-efficient quantum networks and distributed quantum computing.