Concept record · edition 0.1.0
Quantum error correction
What the term means here
Encoding and repeated measurement methods that protect logical quantum information using multiple physical qubits.
Why it matters
Large-scale algorithms require logical operations with error rates far below those of bare physical components.
What this does not establish
A below-threshold memory experiment is not equivalent to demonstrated universal fault-tolerant computation.
Related claims · 2
- qc-004
Quantum error correction protects logical quantum information by distributing it across multiple physical qubits and repeatedly extracting error information.
- qc-005
Below-threshold surface-code memory performance has been experimentally reported, but it is not yet a demonstration of general-purpose fault-tolerant quantum computing.
Sources used here
primary paper · verified
Surface codes: Towards practical large-scale quantum computation
Austin G. Fowler et al. · 2012
Primary technical overview of surface-code fault tolerance.
Source record →primary paper · verified
Quantum error correction below the surface code threshold
Google Quantum AI and collaborators · 2025
Experimental report of below-threshold surface-code memories; it does not demonstrate a general-purpose fault-tolerant computer.
Source record →