Quantum Computing Companies

Sweden · hardware

AdamantQ is a Swedish quantum technology company based in Lund that develops chip-scale quantum sensing and timing devices using crystal defects within synthetically grown diamonds. Its primary product, the Quantum Diamond Atomic Clock (QDi.AC), provides a compact frequency reference with exceptional timing holdover for applications in GPS receivers, inertial navigation systems, and network infrastructure.

Finland · software

Algorithmiq develops quantum algorithms for life sciences and drug discovery applications. The company focuses on creating quantum-enhanced computational methods for molecular simulations and pharmaceutical research. Algorithmiq combines quantum computing expertise with domain knowledge in chemistry and biology to accelerate drug development.

France · hardware

Alice & Bob develops cat qubit quantum computers designed for fault-tolerant quantum computing. Their technology uses superconducting circuits with reduced error rates, aiming to build practical quantum computers that require fewer physical qubits for error correction.

Germany · software

Aqarios provides a cloud-based quantum computing platform called Luna for solving real-world optimization, simulation, and machine learning problems. Spun off from the QAR-Lab at LMU Munich, the company partners with IBM Quantum hardware and works with industrial clients including SAP, BASF, E.ON, and MTU Aero Engines.

France · other

Aqora operates a quantum computing platform focused on datasets and benchmarking. The platform enables researchers and developers to access standardized quantum datasets, run benchmarks, and compare quantum algorithm performance across different hardware.

Finland · hardware

Arctic Instruments is a VTT spin-off specializing in superconducting amplifiers for quantum computers. The company develops ultra-low-noise quantum-limited amplifiers essential for reading out quantum states in superconducting quantum processors. Arctic Instruments' technology enables more accurate and faster qubit measurements, improving the performance and scalability of quantum computing systems.

Poland · software

Beit is a quantum computing software R&D company developing novel quantum algorithms for molecular modelling and computational chemistry. Founded in Krakow, the company focuses on solving NP-complete problems and has organized the Originating Quantum Advantage in Poland workshop, the largest gathering of quantum computing experts in Central and Eastern Europe.

Germany · hardware

Bosch Quantum Sensing is a German quantum sensing company developing quantum sensors using diamond nitrogen-vacancy (NV) centers. Established as a joint venture between Bosch and Element Six, the company focuses on quantum magnetometry and sensing solutions for automotive, industrial, and biomedical applications.

France · hardware

C12 Quantum Electronics builds quantum processors using carbon nanotube-based spin qubits. Their technology combines the coherence advantages of spin qubits with the unique electronic properties of ultra-pure carbon nanotubes to create scalable quantum computers.

Poland · hardware

Creotech Instruments is a publicly traded Polish provider of specialized electronics for quantum computers, satellite systems, and scientific instrumentation. Selected by EuroHPC JU to help build Poland's first quantum computer at the Poznan Supercomputing Center, the company is spinning off its quantum division into a dedicated entity to accelerate development of quantum control systems and QKD hardware.

Netherlands · hardware

Delft Circuits develops scalable cryogenic input/output solutions for quantum computers, addressing a key bottleneck in scaling beyond hundreds of qubits. The company's patented Cri/oFlex technology integrates superconducting materials with filters and attenuators in high-density flex cables, delivering eight times greater channel density than conventional coaxial wiring.

Germany · hardware

eleQtron is a German quantum computing company developing trapped-ion quantum computers using microwave technology. Spun out from the University of Siegen, eleQtron focuses on building scalable quantum processors with innovative ion-trap designs for improved performance and manufacturability.

Italy · hardware

Ephos designs and manufactures glass-based quantum photonic chips at its facility in Milan, the first of its kind worldwide. Founded by researchers from Stanford, Harvard, and Politecnico di Milano, the company has secured EUR 41.5M under the EU Chips Act to build a second manufacturing facility for glass photonic chip production in Italy.

France · software

Eviden, the Atos Group digital business rebranded as Bull in 2026, develops the Qaptiva quantum computing platform for algorithm development, optimization, and emulation on classical HPC infrastructure. The Qaptiva ecosystem includes quantum emulators capable of simulating up to 43 qubits and the open-source myQLM Python framework for quantum programming.

Germany · software

HQS Quantum Simulations is a German quantum software company developing quantum simulation software for materials science and chemistry applications. The company provides quantum algorithms and software tools to accelerate materials discovery and chemical simulations for industrial and research purposes.

Germany · hardware

KEEQuant is a German quantum security company developing quantum key distribution (QKD) systems using integrated photonics. The company provides secure quantum communication solutions for critical infrastructure, government, and enterprise applications, protecting against current and future cyber threats.

Germany · software

Kipu Quantum develops compressed quantum algorithms designed to reduce the resource requirements of quantum computations, aiming to accelerate the timeline to industrially useful quantum computers. Founded in Karlsruhe with offices in Berlin, the company works with hardware partners to co-design application- and hardware-specific quantum solutions for near-term quantum advantage.

Germany · hardware

kiutra is a German deep-tech company developing cryogen-free cooling systems for quantum technologies using magnetic refrigeration. The company provides compact and efficient cooling solutions for quantum computers, quantum sensors, and other cryogenic applications, eliminating the need for liquid helium.

Denmark · software

Kvantify is a Danish quantum computing and TechBio company developing quantum algorithms and high-performance computing solutions for the life sciences sector. The company builds software tools for molecular simulation and drug discovery, and its flagship product Qrunch provides an accessible platform for chemical and biological innovation. Kvantify collaborates with Atom Computing and Danish universities on quantum drug discovery research.

Sweden · hardware

Low Noise Factory is a Swedish manufacturer of cryogenic low-noise microwave amplifiers, founded as a spin-off from Chalmers University of Technology in Gothenburg. The company's ultra-sensitive amplifiers operate near absolute zero and are used in quantum computing readout chains, radio astronomy, and space exploration. Low Noise Factory's products have become a backbone component for superconducting qubit measurement setups worldwide.

Spain · software

Multiverse Computing provides quantum AI software for enterprise applications, specializing in optimization and machine learning. Their flagship product Singularity enables model compression and quantum-inspired algorithms for finance, energy, and manufacturing sectors.

United Kingdom · hardware

Nu Quantum is a Cambridge-based company developing photonic quantum networking technology to connect and scale quantum computers. The company's Qubit-Photon Interface and Entanglement Fabric technology enable modular, distributed quantum computing across multiple hardware platforms including trapped-ion and neutral-atom systems. Nu Quantum has raised over $70 million, including the largest Series A for quantum networking globally.

Netherlands · hardware

Orange Quantum Systems develops automated quantum device testing and characterization equipment. Their solutions enable rapid and reliable testing of quantum processors, helping quantum computing companies accelerate development cycles and improve device quality.

United Kingdom · hardware

ORCA Computing is a London-based quantum computing company building photonic quantum computers that operate at room temperature using telecom-standard single photons stored in quantum memories. Spun out of the University of Oxford, ORCA has delivered systems to the UK Ministry of Defence and the National Quantum Computing Centre, and leads the Quantum Data Centre of the Future consortium.

United Kingdom · hardware

Oxford Quantum Circuits (OQC) is a UK-based quantum computing company spun out of the University of Oxford, developing superconducting quantum processors based on its proprietary Coaxmon three-dimensional qubit architecture. OQC offers quantum-compute-as-a-service and has deployed systems in commercial data centres, with a published roadmap targeting 50,000 logical qubits by 2034.

Austria · software

ParityQC is an Austrian quantum software company developing quantum computing architecture optimization and compiler technology. The company provides ParityOS, a blueprint for quantum computers optimized for solving optimization problems, and works with hardware providers to improve quantum system performance.

United Kingdom · software

Phasecraft is a UK quantum algorithms company co-founded by leading researchers from the University of Bristol and UCL, developing hardware-agnostic quantum algorithms for practical applications in materials discovery, chemistry, and energy optimization. The company works with industry partners including Johnson Matthey, Oxford PV, and BT to translate quantum computing's theoretical promise into near-term commercial advantage.

Germany · hardware

Pixel Photonics develops waveguide-integrated superconducting nanowire single-photon detectors (SNSPDs) that combine high detection efficiency with scalability. Spun off from the University of Münster, the company's detectors serve quantum computing, quantum communication, and LiDAR applications, and are backed by BMBF, EIC, and ESA funding.

Germany · hardware

planqc is a German quantum computing startup developing atom-based quantum computers using optical lattices. Spun out of the Max Planck Institute of Quantum Optics, planqc aims to build scalable quantum processors with thousands of qubits for industrial applications.

Germany · hardware

Q.ANT is a German quantum technology company developing photonic quantum solutions for computing and sensing applications. Spun out from high-tech manufacturer Trumpf, Q.ANT builds quantum sensors and photonic quantum processors using integrated photonics technology for industrial and scientific applications.

Belgium · software

QBee develops quantum computing software for scientific domains including computational chemistry, genomics, and earth observation. Founded by quantum computer architecture professor Koen Bertels, the company translates classical algorithms into quantum-optimized formulations and has won international competitions for quantum climate-change solutions.

Netherlands · hardware

Qblox develops scalable qubit control electronics for quantum computers. A spin-off from QuTech, the company provides modular control systems that enable precise manipulation and readout of qubits for quantum computing research and development.

Denmark · hardware

QDevil is a Danish quantum technology company that develops and manufactures auxiliary electronics and specialized components critical for operating quantum processing units, from millikelvin to room temperature. Originally a spin-out from the Niels Bohr Institute at the University of Copenhagen, QDevil was acquired by Quantum Machines in 2022 and now operates as its Auxiliary Electronics Division from Copenhagen.

Spain · hardware

Qilimanjaro Quantum Tech builds full-stack analog quantum computers based on superconducting fluxonium qubits. A spin-off of IFAE, BSC, and the University of Barcelona, the company won the Quantum Spain tender to build the first Spanish quantum computer and operates the first multimodal quantum data center in Europe at the Barcelona Supercomputing Center.

Finland · software

QMill develops AI-powered quantum circuit optimization software to improve the performance and efficiency of quantum algorithms. The company's technology uses machine learning to automatically optimize quantum circuits, reducing gate counts and improving execution fidelity on real quantum hardware. QMill's solutions aim to bridge the gap between theoretical quantum algorithms and practical implementation.

Switzerland · hardware

Qnami is a Swiss quantum sensing company spun out of the University of Basel, developing nanoscale imaging instruments based on nitrogen-vacancy centers in diamond. The company commercializes quantum microscope technology for applications in nanotechnology, life science, and spintronics device characterization.

Netherlands · hardware

QphoX develops quantum transducers that convert quantum information between microwave and optical frequencies, enabling quantum computers to network over standard telecom fiber. A spin-off from TU Delft's Quantum Nanoscience department, QphoX launched the first commercial quantum transducer in March 2026.

Germany · software

Qruise develops machine learning software for controlling, calibrating, and benchmarking quantum devices. Spun out of Forschungszentrum Jülich and co-founded by Tommaso Calarco, the company creates AI-driven digital twins of quantum systems that help physicists and engineers accelerate hardware development across quantum computing and sensing platforms.

Italy · hardware

QTI is an Italian start-up that engineers, develops, and produces reconfigurable quantum key distribution (QKD) systems. A spin-off of the Italian National Institute of Optics (CNR-INO), the company serves private companies, government agencies, and research institutions with quantum-secured communication solutions.

Finland · software

Quanscient develops quantum-enhanced multiphysics simulation software for engineering and industrial applications. The company combines classical high-performance computing with quantum algorithms to accelerate complex simulations in areas such as electromagnetics, thermal analysis, and structural mechanics. Quanscient's platform aims to reduce simulation times and enable more accurate modeling for product development.

Finland · software

Quantastica provides quantum programming tools and simulators for developers and researchers. The company develops open-source and commercial quantum software development tools, including quantum circuit simulators and programming frameworks. Quantastica's solutions aim to make quantum computing more accessible to software developers through intuitive programming interfaces and educational resources.

United Kingdom · hybrid

Quantinuum is the world's largest integrated quantum computing company, formed in 2021 from the merger of Honeywell Quantum Solutions and Cambridge Quantum. Registered in the UK with European headquarters in Cambridge, the company builds trapped-ion quantum computers (H-Series) that hold the record for highest quantum volume. Quantinuum also develops quantum software including the open-source TKET compiler and quantum cybersecurity products.

Denmark · hardware

Quantum Foundry Copenhagen develops ultra-high-vacuum manufacturing tools and processes for next-generation quantum processor units (QPUs). Owned by the Novo Nordisk Foundation and part of the Novo Nordisk Foundation Quantum Computing Programme (NQCP) at the Niels Bohr Institute, the foundry produces wafer-based integrated circuits with superconducting, semiconducting, and photonic components at extreme atomic and isotopic purity.

Austria · hardware

Quantum Industries is a Vienna-based company specializing in entanglement-based quantum key distribution (eQKD) for secure fiber-optic communications. Founded by quantum communication researchers from a Nobel Prize-winning laboratory, the company manufactures long-distance QKD systems capable of securing infrastructure over distances up to 350 km using entangled photons.

United Kingdom · hardware

Quantum Motion is a UK quantum computing company developing silicon-based quantum processors using industry-standard 300mm CMOS fabrication technology. Founded by researchers from UCL and the University of Oxford, the company delivered the first full-stack silicon CMOS quantum computer to the UK National Quantum Computing Centre and was advanced to DARPA QBI Stage B in 2025.

Germany · hardware

Quantum Optics Jena develops entanglement-based quantum key distribution systems for secure communications. Spun off from the Fraunhofer Institute for Applied Optics and Fine Mechanics (IOF), the company offers the world's first commercial multi-party QKD system, serving government networks, banks, and research institutions.

Austria · hardware

Quantum Technology Laboratories (qtlabs) is a Vienna-based company specializing in free-space and satellite-based quantum communication systems. Building on over 20 years of pioneering research including world-record satellite quantum downlinks, qtlabs develops space-based quantum key distribution technology to enable global quantum-secure communication networks.

Germany · hardware

QuantumDiamonds develops diamond-based quantum sensors using nitrogen-vacancy centers for non-destructive inspection of semiconductor chips. Spun out of the Technical University of Munich, the company's systems detect magnetic fields to localize defects at micrometer scale, with proof-of-concept work completed with nine of the world's ten largest chip manufacturers.

Netherlands · hardware

QuantWare manufactures superconducting quantum processors for the global quantum computing industry. As a dedicated quantum chip supplier, they provide off-the-shelf and custom quantum processing units to research institutions and companies building quantum computers.

France · software

Qubit Pharmaceuticals accelerates drug discovery through molecular simulation powered by hybrid HPC and quantum computing. Spun out of research at Sorbonne University, CNRS, and CNAM, the company's Atlas platform models molecular interactions at quantum-level accuracy, and has demonstrated a practical path to quantum utility in drug discovery by 2028.

Netherlands · hardware

QuiX Quantum builds photonic quantum processors based on silicon nitride waveguide technology, requiring no cryogenic cooling. The company has deployed over 15 systems worldwide, including 8-qubit and 64-qubit photonic quantum computers to the German Aerospace Centre (DLR), and secured EUR 15M in Series A funding to deliver a universal photonic quantum computer.

Denmark · cloud

QuNorth is a Danish joint venture established by EIFO and the Novo Nordisk Foundation with EUR 80 million in funding to procure and operate the Magne quantum computer in Copenhagen. Magne, delivered by Atom Computing and Microsoft, will be a level-2 quantum system with 50 logical qubits and over 1,200 physical neutral-atom qubits, projected to be the first commercially available fault-tolerant quantum computer when operational in late 2026.

France · hardware

Quobly develops silicon spin qubit quantum computers leveraging semiconductor manufacturing techniques. Based in Grenoble near CEA-Leti, the company focuses on building scalable quantum processors using established silicon fabrication processes.

Germany · hardware

qutools develops and manufactures precision instruments for quantum physics experiments, including entangled photon sources, quantum random number generators, and quantum cryptography systems. Founded by quantum physicists from Ludwig-Maximilians-University Munich, the company serves both scientific research and industrial applications in quantum information.

United Kingdom · software

Riverlane is a Cambridge-based quantum computing company focused on quantum error correction (QEC) technology. The company develops hardware-agnostic QEC decoders, including its Local Clustering Decoder, that enable quantum computers to perform reliable computations at scale. Riverlane has raised over $125 million in total funding, including Europe's first Series C round in quantum computing.

Italy · hardware

Rotonium is an Italian deep-tech startup developing room-temperature photonic quantum computers using single-photon qudit technology. Based in Padua and backed by CDP Venture Capital, the company builds silicon photonics components that enable compact quantum systems operable on Earth, in the air, and in space without cryogenic cooling.

Germany · hardware

SaxonQ develops mobile quantum computers based on nitrogen-vacancy centers in diamond that operate at room temperature without cryogenic cooling. Spun off from the Felix Bloch Institute at Universität Leipzig, the company produces commercially available quantum systems connected to the DLR Quantum Computing Initiative's QCI Connect platform.

Sweden · hardware

SCALINQ is a Swedish quantum hardware company and spin-off from Chalmers University of Technology in Gothenburg. The company develops cost-efficient, energy-efficient, high-density cryogenic-grade hardware for superconducting and spin-qubit quantum processors. Its patent-pending LINQER product family provides complete packaging solutions and sample holders with 16 to 300 connectors for quantum computing systems.

Finland · hardware

SemiQon Technologies is a VTT spin-off developing silicon-based quantum processors. The company leverages semiconductor manufacturing expertise to build scalable quantum computing hardware using silicon quantum dot technology. SemiQon aims to bring quantum computing closer to industrial production through compatibility with existing semiconductor fabrication processes.

Denmark · hardware

Sparrow Quantum develops single-photon sources for quantum networking and quantum computing applications. Their technology provides deterministic single-photon emission, enabling scalable quantum communication networks and photonic quantum information processing.

Switzerland · hybrid

Terra Quantum is a Swiss quantum technology company developing a hybrid quantum-classical computing platform for enterprise applications. The company combines quantum algorithms with classical computing infrastructure to deliver practical quantum solutions for optimization, machine learning, and cryptography challenges.

United Kingdom · hardware

Universal Quantum is a University of Sussex spin-out building large-scale trapped-ion quantum computers using microwave-based qubit control instead of lasers, combined with a modular chip architecture connected via electric-field links. The company holds a EUR 67 million contract from Germany's DLR to build fault-tolerant quantum systems and has raised close to GBP 100 million in combined public and private funding.

France · software

VeriQloud develops software and protocols for secure quantum communication networks, including quantum key distribution and cloud-based quantum computing access. The company contributes to the FranceQCI national quantum communication infrastructure project and offers HyQloud, a full-stack solution for hybrid classical-quantum cloud datacenters.

France · hardware

Welinq develops quantum networking hardware and software to interconnect quantum processors into scalable networks. A spin-out from Sorbonne University and CNRS, the company builds the highest-performance quantum memories based on clouds of laser-cooled atoms, enabling distributed quantum computing architectures for data centers.

Germany · hardware

XeedQ develops quantum processors based on spin qubits in diamond, producing compact, energy-efficient solid-state quantum computers. Awarded EUR 30 million by the DLR Quantum Computing Initiative, the company aims to deliver a 32-qubit fault-tolerant system by 2026 and 256+ qubit mobile processors by 2028.

Finland · software

Xiphera develops post-quantum cryptography IP cores and hardware security solutions. The company provides FPGA and ASIC implementations of quantum-resistant cryptographic algorithms to protect systems against future quantum computing threats. Xiphera's solutions enable organizations to prepare for the post-quantum era by implementing standardized quantum-safe encryption in their hardware infrastructure.

Switzerland · hardware

Zurich Instruments is a Swiss manufacturer of quantum computing control systems, lock-in amplifiers, and arbitrary waveform generators. Spun out of ETH Zurich and acquired by Rohde & Schwarz in 2021, the company provides the hardware layer between software and physical qubits, with its ZQCS platform designed for large-scale quantum computer operation.

Switzerland · hardware

ZuriQ is an ETH Zurich spin-off developing a novel two-dimensional trapped-ion quantum computing architecture. Unlike conventional one-dimensional ion chain designs, ZuriQ uses combined electric and magnetic fields to allow ions to move freely in two dimensions on a quantum chip, addressing the qubit-scaling limitations of current trapped-ion systems.