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Rigetti is a publicly traded pure-play quantum computing company that designs and manufactures superconducting quantum processors in its own fabrication facility — one of only a few quantum companies with in-house fab capability. Its current Ankaa-2 system (84 qubits) uses tunable couplers and a square lattice for 98% median two-qubit gate fidelity. Rigetti also sells QPUs directly through its Novera product line, and offers cloud access via Amazon Braket and Azure Quantum. In collaboration with Riverlane, it demonstrated real-time low-latency quantum error correction in 2024.

IQM is Europe's leading quantum hardware company, having delivered 15 operational quantum systems to 13 customers across Europe, including installations at supercomputing centers in Germany (LRZ in Munich, Leibniz), Spain (CESGA), and Finland (VTT). Its 150-qubit Radiance system is designed for HPC integration. IQM is vertically integrated across the full stack — from chip design to cryogenic systems and software. The company raised over €1 billion and opened its first U.S. quantum technology center at the University of Maryland in 2025.

IonQ is the first publicly traded pure-play quantum computing company, specializing in trapped-ion quantum computers. Its systems use individual atomic ions manipulated by lasers, offering high connectivity and long coherence times. The current Tempo architecture (2025) delivered 100+ physical qubits using barium atoms three months ahead of schedule, following the acquisition of Oxford Ionics. IonQ's systems are available on Amazon Braket, Azure Quantum, and Google Cloud. The Forte Enterprise is designed for on-premises data center integration.

Pasqal builds neutral-atom quantum processors using arrays of individually trapped rubidium atoms, offering both analog and digital modes of quantum computing. With over 1,000 atoms in its latest systems, Pasqal operates one of the largest neutral-atom processors worldwide. Spun out of Institut d'Optique and founded by quantum physics pioneers including Nobel laureate Alain Aspect's research group. Pasqal acquired Qu&Co (quantum software) in 2022 and has partnerships with NVIDIA (CUDA-Q), Crédit Agricole, and several European HPC centers.