2026
Below threshold
The Willow chip showed that more physical qubits mean exponentially fewer errors overall.
Branches · QUANTUM
Logical qubits
Quantum computers make constant errors. We learned to combine many unreliable qubits into one reliable one — and for the first time a bigger machine means fewer total errors.
Error correction stopped being a physics experiment and became an engineering discipline. Useful advantage is still far off, but the curve finally bends the right way.
Status
TypeBranches
Marker
What exists today8
Researched
2026-03
94 logical qubits
Quantinuum on the H-series; several vendors now report 90–100 logical qubits.
2026-03
99.99% fidelity
IonQ and Silicon Quantum Computing lead the operation fidelity table.
In progress
2026
Sub-microsecond decoding
Correction latency dropped below a microsecond — the precondition for real-time operation.
2026
qLDPC codes
Architectures are diverging: there is no single path to fault tolerance any more, each platform has its own.
препятствие
No useful advantage yet
No commercially valuable task has been solved faster than on a classical computer. Remember that behind any quantum headline.
Planned
в планах
Post-quantum migration
The move to new crypto standards is happening early: traffic captured today gets decrypted once the machine exists.
Distant horizons
впереди
Chemistry on qubits
The first genuinely useful application — simulating molecules and catalysts beyond classical machines.
Branches off
To the line