Quantum Computers Ranked by Qubit Count
This is a spec ranking, not a financial one — and it comes with the most important caveat in quantum computing: raw qubit counts are not comparable across technologies. D-Wave's thousands of annealing qubits solve a different (narrower) class of problems than a gate-based machine, and 100 high-fidelity trapped ions can outperform many more noisy superconducting qubits. That said, "who has the most qubits" is the question everyone asks, so here is each public company's flagship system ranked by physical qubit count, with modality and two-qubit gate fidelity shown so the numbers can be read in context.
As of · updates with live market data
Not ranked (no physical qubits data yet): QUBT, ARQQ, QSI, HQ.
The companies, in order
1. D-Wave Quantum (QBTS) — 4,400
D-Wave is the world's first commercial quantum computing company, specializing in quantum annealing technology for optimization problems. Its systems are used in logistics, finance, and drug discovery.
QBTS live data, financials & filings →2. Rigetti Computing (RGTI) — 108
Rigetti Computing is a full-stack quantum-classical computing company using superconducting qubits. It fabricates its own chips at Fab-1 and provides cloud access through Quantum Cloud Services (QCS).
RGTI live data, financials & filings →3. IonQ (IONQ) — 100
IonQ develops trapped-ion quantum computers accessible via cloud through AWS Braket, Azure Quantum, and Google Cloud. The company builds full-stack quantum hardware and software targeting fault-tolerant quantum computing.
IONQ live data, financials & filings →4. Infleqtion (INFQ) — 100
Infleqtion (formerly ColdQuanta) designs and builds quantum computers, precision sensors, and quantum software using cold atom and neutral atom technology. Its Sqale quantum computer has been commercially deployed at the UK National Quantum Computing Centre.
INFQ live data, financials & filings →5. Quantinuum (QNT) — 98
Quantinuum develops trapped-ion quantum computers and quantum software, spun out of Honeywell in 2021. Its H-Series and Helios systems hold world records in gate fidelity and quantum volume. Software platforms include InQuanto (quantum chemistry), Quantum Origin (cybersecurity entropy), and lambeq (quantum NLP/AI). IPO: Nasdaq June 2026.
QNT live data, financials & filings →6. IQM Quantum Computers (IQMX) — 54
IQM Quantum Computers is Europe's largest quantum computing hardware company, building on-premises superconducting quantum computers for national labs, HPC centers and universities — with systems delivered across Finland, Germany, Spain, Poland, South Korea, Taiwan and beyond. It operates its own chip fabrication facility in Espoo, Finland.
IQMX live data, financials & filings →7. Xanadu (XNDU) — 12
Xanadu is a photonic quantum computing company developing room-temperature, light-based quantum computers and open-source quantum software. Its Aurora system (Jan 2025) is the world's first scalable modular photonic quantum computer. PennyLane is the leading open-source quantum ML library.
XNDU live data, financials & filings →Methodology: Qubit counts are company-reported figures for each company's flagship publicly disclosed system, refreshed when companies announce new hardware. Annealing qubits (D-Wave) are not gate-model qubits. Companies without quantum hardware (software, security and sensing pure plays) are excluded. Covers the US-listed pure-play quantum universe tracked by this site. Full metric definitions on the methodology page. Not investment advice.
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