2:1 physical-to-logical qubit ratio (with Harvard/MIT)

QuEra / Harvard / MIT — QuEra, Harvard and MIT showed qLDPC codes encoding 1,156 logical qubits into 2,304 physical (≈2:1, >50% rate), simulated into the "teraquop" regime (~1 error per trillion ops) — versus the hundreds-to-one ratio typical today.