Top 10 European Quantum Computing Companies 2026

UK-based OQC operates Europe's most commercially accessible superconducting quantum computers via its QCaaS platform on AWS and Azure, serving HSBC, Moody's, and 50+ enterprise clients. The company raised $100 million in Series B in 2022 and its Toshiko 128-qubit processor achieves gate fidelities above 99.5%. OQC is the first European company to offer commercial quantum cloud services.

Helsinki-based IQM builds superconducting quantum computers for research centres and governments, raising €128 million by 2023 from EIC Fund, Google Ventures, and MIG Capital. The company delivered quantum systems to Finland's VTT and Germany's Leibniz Supercomputing Centre, providing 54-qubit and 20-qubit co-design processors. IQM aims to deploy 1,000 quantum computers globally by 2030.

Paris-based Alice & Bob is pioneering cat qubit error correction, achieving 1,800x noise suppression with its self-correcting Schrodinger's cat qubit that reduces the overhead needed for fault-tolerant quantum computing by 200x. The company raised €30 million in Series A in 2022 and published a roadmap to demonstrate fault-tolerant computation by 2027. Its approach requires only 1,500 physical qubits per logical qubit vs. 1 million for competing methods.

UK-founded Quantinuum (formed from Honeywell Quantum and Cambridge Quantum) is the world's largest integrated quantum computing company, valued at $5 billion in 2023. Its trapped-ion H-Series processors achieve the world's highest quantum volume of 2^17 and best two-qubit gate fidelity at 99.9%. The company employs 500+ scientists and has 400+ quantum patents, with applications in materials science, quantum chemistry, and cybersecurity.

Paris-based Quandela builds photonic quantum computers using single-photon sources, offering Europe's first cloud-accessible photonic QPU via its Perceval SDK. The company raised €20 million in Series A in 2022 and holds the world record for single-photon source efficiency at 99.5%. Its Mosaiq photonic processor executes variational quantum algorithms 100x faster than classical simulators on specific chemistry tasks.

Oxford-founded Quantum Motion uses CMOS-compatible silicon spin qubits manufactured on existing semiconductor fabs, enabling mass production of quantum processors at semiconductor economics. The company raised £50 million in 2023 and demonstrated a 2-qubit silicon processor in Nature in 2024, showing that its approach can scale to millions of qubits using standard 300mm wafer processes. Commercial products are targeted for 2028.

Stuttgart-based Q.ANT is the quantum technology subsidiary of TRUMPF, the world's largest industrial laser company, developing quantum sensors, optical clocks, and photonic chips for classical computing. Backed by TRUMPF's €4.8 billion revenue base, Q.ANT has deployed quantum gravimeters capable of 10 nanometre resolution for civil engineering and natural resource exploration. Its photonic chips enable LiDAR systems with 10x higher resolution at half the cost.

Munich-based planQC uses individual neutral atoms trapped by optical tweezers as qubits, achieving 99.5% two-qubit gate fidelity in a 50-qubit system demonstrated in 2024. The company raised €4.6 million in seed funding from the EIC and High-Tech Grunderfonds in 2022, with €50 million Series A closed in 2025. planQC targets fault-tolerant commercial quantum advantage in finance and logistics by 2028.

Dublin-based Equal1 has built the world's first fully integrated CMOS quantum computer on a single chip, combining quantum and classical processors in standard silicon technology at operating temperatures of -269°C. The company raised $24 million in Series A in 2022 and demonstrated a 3-qubit silicon spin processor. Its silicon quantum integration roadmap targets 10,000 qubits on a chip no larger than a smartphone processor by 2030.

UK-based OQC operates Europe's most commercially accessible superconducting quantum computers via its QCaaS platform on AWS and Azure, serving HSBC, Moody's, and 50+ enterprise clients. The company raised $100 million in Series B in 2022 and its Toshiko 128-qubit processor achieves gate fidelities above 99.5%. OQC is the first European company to offer commercial quantum cloud services.

Helsinki-based IQM builds superconducting quantum computers for research centres and governments, raising €128 million by 2023 from EIC Fund, Google Ventures, and MIG Capital. The company delivered quantum systems to Finland's VTT and Germany's Leibniz Supercomputing Centre, providing 54-qubit and 20-qubit co-design processors. IQM aims to deploy 1,000 quantum computers globally by 2030.

Paris-based Alice & Bob is pioneering cat qubit error correction, achieving 1,800x noise suppression with its self-correcting Schrodinger's cat qubit that reduces the overhead needed for fault-tolerant quantum computing by 200x. The company raised €30 million in Series A in 2022 and published a roadmap to demonstrate fault-tolerant computation by 2027. Its approach requires only 1,500 physical qubits per logical qubit vs. 1 million for competing methods.

UK-founded Quantinuum (formed from Honeywell Quantum and Cambridge Quantum) is the world's largest integrated quantum computing company, valued at $5 billion in 2023. Its trapped-ion H-Series processors achieve the world's highest quantum volume of 2^17 and best two-qubit gate fidelity at 99.9%. The company employs 500+ scientists and has 400+ quantum patents, with applications in materials science, quantum chemistry, and cybersecurity.

Paris-based Quandela builds photonic quantum computers using single-photon sources, offering Europe's first cloud-accessible photonic QPU via its Perceval SDK. The company raised €20 million in Series A in 2022 and holds the world record for single-photon source efficiency at 99.5%. Its Mosaiq photonic processor executes variational quantum algorithms 100x faster than classical simulators on specific chemistry tasks.

Oxford-founded Quantum Motion uses CMOS-compatible silicon spin qubits manufactured on existing semiconductor fabs, enabling mass production of quantum processors at semiconductor economics. The company raised £50 million in 2023 and demonstrated a 2-qubit silicon processor in Nature in 2024, showing that its approach can scale to millions of qubits using standard 300mm wafer processes. Commercial products are targeted for 2028.

Stuttgart-based Q.ANT is the quantum technology subsidiary of TRUMPF, the world's largest industrial laser company, developing quantum sensors, optical clocks, and photonic chips for classical computing. Backed by TRUMPF's €4.8 billion revenue base, Q.ANT has deployed quantum gravimeters capable of 10 nanometre resolution for civil engineering and natural resource exploration. Its photonic chips enable LiDAR systems with 10x higher resolution at half the cost.

Munich-based planQC uses individual neutral atoms trapped by optical tweezers as qubits, achieving 99.5% two-qubit gate fidelity in a 50-qubit system demonstrated in 2024. The company raised €4.6 million in seed funding from the EIC and High-Tech Grunderfonds in 2022, with €50 million Series A closed in 2025. planQC targets fault-tolerant commercial quantum advantage in finance and logistics by 2028.

Dublin-based Equal1 has built the world's first fully integrated CMOS quantum computer on a single chip, combining quantum and classical processors in standard silicon technology at operating temperatures of -269°C. The company raised $24 million in Series A in 2022 and demonstrated a 3-qubit silicon spin processor. Its silicon quantum integration roadmap targets 10,000 qubits on a chip no larger than a smartphone processor by 2030.