Quantum Technology companies in Europe

Multiverse ComputingSan Sebastián, Spain · 201-500

Compresses large language models using tensor network methods so organisations can run advanced AI on edge devices, existing hardware and air-gapped infrastructure at a fraction of normal compute cost.

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.

eleQtronSiegen, Germany · 11-50

Builds trapped-ion quantum computers using proprietary microwave-based MAGIC technology for industrial applications in optimization, materials simulation and logistics.

QuantumDiamondsMunich, Germany · 11-50

Builds quantum diamond microscopes that use nitrogen-vacancy sensors to map electrical defects in semiconductor chips with 100x higher resolution than traditional inspection tools.

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.

planqcGarching, Germany · 51-200

Builds neutral-atom quantum computers and full-stack quantum software for scientific and industrial applications, spun out of the Max Planck Institute of Quantum Optics.

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

Builds miniaturised cold atom quantum hardware for GPS-independent navigation, timing and sensing in defence, telecoms and critical infrastructure.

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.

PasqalMassy, France · 201-500

Builds neutral-atom quantum processors for industrial optimization and simulation. Partners with MBDA on defence optimization and Thales on satellite mission planning, backed by France's Defence Innovation Fund with over €340 million in financing.

Q*BirdDelft, Netherlands · 11-50

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

Adamant QuantaLund, Sweden · 1-10

Deep-tech startup developing chip-scale quantum sensors and diamond-based atomic clocks for resilient positioning, navigation and timing in GNSS-denied environments. Selected for NATO DIANA's 2026 cohort and backed by Industrifonden, Almi Invest and Navigare Ventures.

ArqitLondon, United Kingdom · 50-100

Builds quantum-safe encryption software that protects government, defence and telecoms networks from current cyber threats and future quantum computing 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.

CUbIQ TechnologiesEindhoven, Netherlands · 1-10

Quantum key distribution (QKD) startup developing the first CV-QKD transceiver in a standard QSFP-28 pluggable form factor, integrating quantum encryption into existing fibre networks. TU Eindhoven spinoff selected for NATO DIANA 2025 accelerator. Established the first quantum-secured government connection in the Netherlands.

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.

ID QuantiqueGeneva, Switzerland · 51-200

Geneva-based quantum technology pioneer producing quantum key distribution systems, quantum random number generators, and single-photon detection devices. Founded in 2001 as a University of Geneva spin-off, now part of IonQ, with 150+ employees including 70 quantum physicists and engineers.

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.

ParityQCInnsbruck, Austria · 11-50

Quantum architecture company developing blueprints and operating systems for scalable quantum computers. Won a €35M contract from Germany's Cyber Agency to build the world's first mobile quantum computer for defence applications by 2027.

QTI Quantum Telecommunications ItalyFlorence, Italy · 11-50

Italian quantum communications company founded in 2020 as a CNR spin-off, developing industrial Quantum Key Distribution systems for government and defence. Its QKD links secured Italian G7 summit communications and it is building quantum repeaters under a 7 million euro EU contract.

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 IndustriesVienna, Austria · 11-50

Entangled-photon Quantum Key Distribution systems for government and critical infrastructure, covering distances up to 350 km. Founded by IQOQI Vienna scientists, raised €9.5M in 2025, and supplies the European Quantum Communication Infrastructure (EuroQCI) programme.

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.

SitehopUnited Kingdom · 11-50

Hardware-based ultra-low-latency encryption for data in motion, including the SAFE Series delivering 200 Gbps full duplex throughput and post-quantum crypto-agility. Raised £7.5M Series A in 2025 and supplies government, critical infrastructure, and telecom networks.

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.