Error-corrected qubit milestone reported by a quantum hardware group
A logical qubit sustains lower error rates than its underlying physical qubits for an extended period.
Why it matters
Useful quantum computing depends on error correction working, not on physical qubit counts. Progress on logical qubit quality is the only metric that moves the timeline.
Source
Huburb demo record. This is a development-phase placeholder record; no external source is attached and none has been invented.