Toric Code Outperforms Monolithic Qubits Below 0.05% Error Rate

Researchers have shown that quantum devices within a modular network can be swapped or replaced during operation with minimal impact on logical error rates, a key step toward building truly reliable and scalable quantum computers. The study, by Evan Sutcliffe and Coral M. Westoby, details how distributed quantum error correction codes, specifically toric and hyperbolic Floquet codes, can maintain logical information even with the complete failure of modular nodes. Importantly, the researchers suggest a distributed toric code would outperform a monolithic qubit implementation when physical error rates fall below 0.05 percent, revealing a threshold where distributed systems gain a clear advantage. This resilience to catastrophic failure, defined as a probability of p divided by 100, offers a promising pathway to scaling quantum computing beyond the limitations of single, large processors. A surprising advantage emerges…