Qubit History
| Date | Quantum system | Organization | LQ | Title |
|---|---|---|---|---|
| 2023-12-06 |
Harvard Neutral-Atom Logical Processor
|
Harvard University (Lukin Group)
|
48 | Harvard & QuEra: 48 Logical Qubits with Error-Detected Complex Logical Circuits |
| 2024-01-18 |
GKP Propagating Light
|
University of Tokyo (Furusawa Group)
Johannes Gutenberg University Mainz (van Loock Group)
Palacký University Olomouc
National Institute of Information and Communications Technology (NICT)
RIKEN
|
1 | U. Tokyo + Mainz: World's First Optical GKP Logical Qubit |
| 2024-04-03 |
Microsoft & Quantinuum Collaboration
|
Microsoft
Quantinuum
|
4 | Microsoft & Quantinuum: 4 Logical Qubits with 800× Error Improvement |
| 2024-09-10 |
Microsoft & Quantinuum Collaboration
|
Microsoft
Quantinuum
|
12 | Microsoft & Quantinuum: 12 Logical Qubits + First Hybrid Chemistry Simulation |
| 2024-11-19 |
Microsoft & Atom Computing Collaboration
|
Microsoft
Atom Computing
|
28 | Microsoft & Atom Computing: 28 Logical Qubits, Record GHZ Entanglement |
| 2024-12-09 |
Willow
|
Google Quantum AI
|
1 | Google Willow: 1 Logical Qubit Below the Surface Code Threshold |
| 2025-06-25 |
IBM Quantum System
|
IBM Quantum
|
2 | IBM Loon: 2 Logical Qubits — First Step on the Fault-Tolerant Roadmap |
| 2025-10-07 |
Pasqal Neutral-Atom QPU
|
Pasqal
|
2 | Pasqal: 2 Logical Qubits — European First on Neutral Atom Platform |
| 2025-11-05 |
Helios
|
Quantinuum
|
48 | Quantinuum Helios: 48 Logical Qubits at ~2:1 Base-to-Logical Overhead |
| 2025-11-10 |
Harvard Neutral-Atom Logical Processor
|
Harvard University (Lukin Group)
|
96 | Harvard & QuEra: 96 Logical Qubits with Universal Fault-Tolerant Architecture |
| 2025-11-20 |
IonQ Trapped-Ion (Barium / Oxford Ionics EQC)
|
IonQ
|
0 | IonQ: 0 Logical Qubits — No QEC Demonstration to Date |
| 2025-12-05 |
Infleqtion Neutral-Atom Quantum Computer
|
Infleqtion
|
2 | Infleqtion: 2 Logical Qubits with Gottesman Protocol Complete Realization |
| 2025-12-22 |
Zuchongzhi 3.2
|
USTC (Pan Jianwei Group)
|
1 | USTC Zuchongzhi 3.2: First Non-US Below-Threshold QEC (Λ = 1.40) |