Computing · Frontier Compute
Quantum Processor Qubits
From 2-qubit lab demos in 1998 to 6,100-qubit arrays today: physical qubits compound, but useful logical qubits are still double-digit.
- 3,000-fold in 26 years
- Logical qubits still ≤ ~100
- ~1% error/gate breaks long circuits
- Race shifted to error correction
Physical qubit counts in frontier quantum processors have grown from a single 2-qubit NMR demo in 1998 to neutral-atom arrays exceeding 6,000 qubits today, an over 3,000-fold expansion in 26 years. But physical qubits are noisy, with error rates around 1% per gate, so an algorithm of thousands of gates is essentially guaranteed to produce garbage. Useful computation needs error-corrected "logical qubits", and the best demonstration so far ran up to 96 of them at once (a Harvard-led team, Nature, January 2026); most devices have zero. Across IBM, Google, Quantinuum, QuEra, and Atom Computing the focus has accordingly shifted from raw qubit counts to demonstrating error correction. The headline numbers are real; practical capability lags far behind.
| Year | Value | Note | Projected |
|---|---|---|---|
| 1998 | 2 | NMR, first 2-qubit demo | |
| 2001 | 7 | Shor factors 15 | |
| 2006 | 12 | 12-qubit NMR benchmark | |
| 2017 | 50 | IBM 50-qubit announced | |
| 2019 | 53 | Google Sycamore, supremacy claim | |
| 2020 | 65 | ||
| 2021 | 127 | IBM Eagle | |
| 2022 | 433 | IBM Osprey | |
| 2023 | 1,180 | Atom Computing 1,180; IBM Condor 1,121 | |
| 2024 | 6,100 | 6,100-qubit neutral atom array |