European Quantum Technology Companies

QuandelaMassy, France · 201-500

World leader in full-stack photonic quantum computing, developing hardware, middleware, and software for industrial applications including energy, cybersecurity, and finance.

MosaiQ

Datacenter-ready photonic quantum computer available in 6 to 24-qubit configurations, air-cooled and deliverable in 8-10 months.

Ascella

6-qubit photonic quantum computer launched in 2022 as the first functional photonic QPU, accessible via Quandela Cloud to 1,200+ users across 30 countries.

Belenos

12-qubit photonic quantum computer delivering 4,000x more computing power than Ascella, with first integrated version delivered to CEA-TGCC supercomputer center.

QuantumDiamondsMunich, Germany · 11-50

Builds quantum diamond microscopes for non-destructive defect imaging and current mapping in semiconductor chips and wafers.

CyberneticaTallinn, Estonia · 51-200

Builds secure data exchange platforms, digital identity systems and maritime surveillance infrastructure for governments in 40+ countries, with roots in creating the technology behind e-Estonia.

SECQAILondon, United Kingdom · 1-10

Designs memory-safe semiconductors with post-quantum cryptography for securing servers, edge devices and critical infrastructure against both current and quantum-era threats.

IQMEspoo, Finland · 201-500

Designs and manufactures full-stack superconducting quantum computers for research institutions, HPC centres and enterprises, available on-premises or via cloud.

Nu QuantumCambridge, United Kingdom · 51-200

Builds quantum networking hardware that connects quantum processors into distributed computing architectures, enabling commercial-scale quantum computing.

Quantum Networking Unit (QNU)

A 19-inch rack-mount system hosting photonic integrated circuits that distributes quantum entanglement across connected processors. Launched in June 2025, the QNU provides reconfigurable connectivity between quantum computing nodes for datacenter-scale quantum architectures. Nu Quantum describes it as the world's first product of its kind, delivering 99.7% entanglement fidelity at a 1 MHz attempt rate.

Entanglement Fabric

Nu Quantum's distributed quantum computing architecture, combining its networking hardware with a software abstraction layer for qubit-agnostic application development. The Entanglement Fabric defines how modular quantum processors interconnect and scale, and is the overall framework that the QPI and QNU are designed to populate.

Aquark TechnologiesFareham, United Kingdom · 1-50

Quantum technology company developing miniaturized cold atom systems for quantum sensing, computing and communications. Creates portable hardware solutions using "supermolasses" technique for quantum devices, backed by NATO and selected for NATO DIANA accelerator.

ArquimeaMadrid, Spain · 201-500

Deep-tech company building sensors, space systems, robotics, and quantum technology for defence and aerospace applications.

Q-SLAM-40

A man-portable loitering munition with 25 km range and 25-minute endurance, carrying a 1.2 kg warhead, deployable from backpacks by a two-person team in under 5 minutes with GPS-denied operation capability.

Q-SLAM-100

A medium-range loitering munition with 120-minute endurance and 60-70 km range, equipped with the DeepArq AI platform for collaborative flight, autonomous target identification, and real-time threat classification.

Techfire

A fire control system for mortars and artillery howitzers that automates direct and indirect fire operations, currently in service with multiple NATO armed forces and armies in the Asia-Pacific region.

CryptoNext SecurityParis, France · 1-50

Builds post-quantum cryptography software that helps governments, financial institutions and critical infrastructure operators inventory their cryptographic assets and migrate to quantum-resistant encryption.

ArqitLondon, United Kingdom · 50-100

Quantum-safe encryption technology company providing cybersecurity solutions via satellite and terrestrial forms. Develops QuantumCloud platform delivering quantum-resistant encryption to protect data from current and future threats including quantum computer attacks.

QuSideBarcelona, Spain · 11-50

Builds quantum random number generators and randomness processing units that give encryption systems a hardware-verified source of entropy, covering embedded chipsets through to cloud-scale computing.

AegiQSheffield, United Kingdom · 1-50

Full-stack photonic quantum computing company developing quantum technologies for defence, aerospace, cybersecurity and communications applications. Provides quantum computing platforms, quantum communication systems, and quantum cryptography solutions.

Alea Quantum TechnologiesCopenhagen, Denmark · 2-10

Alea Quantum Technologies produces high-speed Quantum Random Number Generators (QRNG) for secure data transmission. Based on 20+ years of research at Technical University of Denmark, their technology uses laser and photodetector for quantum measurement to generate truly random numbers for cybersecurity applications. The company serves quantum communication, financial services, telecom, data centers, and military/defense sectors with solutions that are cheaper, faster, and provide higher security than competing alternatives.

eleQtronHanover, Germany · 11-50

Trapped-ion quantum computers for military logistics optimization, cryptography, and complex simulation workloads.

EphosMilan, Italy · 11-50

Ephos designs and manufactures glass-based integrated photonic circuits using femtosecond laser writing techniques that power advanced classical and quantum computing devices.

g2-ZeroMadrid, Spain · 1-10

Develops plug-and-play single-photon sources for quantum technologies market, creating electrical, vibration-resistant and alignment-free semiconductor-based quantum devices.

KETS Quantum SecurityBristol, United Kingdom · 11-50

Builds chip-based quantum key distribution (QKD) and quantum random number generation (QRNG) hardware for securing defence, telecoms and critical infrastructure against quantum-era threats.

levelQuantumMilan, Italy · 1-10

Develops quantum cybersecurity solutions through quantum key distribution technology. Provides unconditional security for communications using quantum physics principles.

Munich Quantum InstrumentsMunich, Germany · 11-50

Develops superconducting single-photon detectors for photonic quantum sensing and optical quantum computing. Specializes in quantum sensing instrumentation.

NanomadeToulouse, France · 11-50

Manufactures quantum deformation sensors using nanoparticle technology for ultra-sensitive strain detection. Provides quantum sensing solutions for structural monitoring.

planqcGarching, Germany · 51-200

Neutral-atom quantum computing startup spun out of the Max Planck Institute of Quantum Optics. Commissioned by the German government to deploy a 1,000-qubit quantum computer at the Leibniz Supercomputing Centre and won a EUR 29M DLR contract.

Q*BirdDelft, Netherlands · 11-50

Develops quantum key distribution (QKD) technology providing ultra-secure data communications and quantum networking solutions for critical infrastructure.

Quantum DiceOxford, United Kingdom · 11-50

Award-winning quantum technology spinout from Oxford University developing quantum random number generators (QRNGs) that provide verifiably secure random numbers for cybersecurity applications.

Quantum Optics JenaJena, Germany · 11-50

Builds quantum key distribution systems for ultra-secure fibre and satellite communications. Fraunhofer IOF spin-off whose entangled photon-pair sources are independently certified and deployed in European quantum network projects. Founded in 2020 in Jena.

ResQuantLodz, Poland

Deep-tech cybersecurity company focused on hardware implementation of post-quantum cryptography standards. Their secure element chiplet integrates NIST-selected PQC algorithms at the silicon level.

Sonovero R&DGoleniow, Poland · 1-10

Develops quantum computing hardware and secure access platforms for military IT applications. Part of the PLN 56 million MIKOK consortium building modular quantum computer infrastructure for the Polish Armed Forces under NCRD funding.