Companies directory
The directory of quantum companies.
177 quantum companies in our knowledge base, each mapped to the directory investors that backed it, sorted by how many.
- AEPONYX Montreal developer of photonic integrated circuits for light control, acquired by Pasqal in 2025. Acquired 0 investors
- Akhetonics All-optical digital processor (RPU) for reasoning, verification and optimization workloads. Seed 2 investors
- Algorithmiq Quantum algorithms and error mitigation software for healthcare and life sciences. 0 investors
- Alice & Bob Fault-tolerant quantum computing company developing cat-qubit processors. Series B 4 investors
- Aliro Technologies Software for entanglement-based quantum networks. 2 investors
- Aqarios Quantum Technologies Munich quantum software company (LMU spin-off) listed on the Düsseldorf Stock Exchange via a SPAC. Public 0 investors
- Arqit Quantum Quantum-safe encryption software (post-quantum cryptography) for governments and enterprises, listed on Nasdaq. Public 0 investors
- Atlantic Quantum MIT spin-out building superconducting quantum computing hardware; team joined Google Quantum AI in October 2025. 0 investors
- Atom Computing Neutral-atom quantum computing hardware company. Series C 2 investors
- Avalanche PhotoniQ Single-photon detectors based on semiconductor metasurfaces for quantum computing, communication and sensing. Acquired 0 investors
- Bluefors Cryogenic measurement systems supplier for quantum technology and low-temperature research. Growth 0 investors
- Brightlight Photonics CMOS-compatible on-chip lasers for quantum, biomedicine, and metrology. 0 investors
- BTQ Technologies Post-quantum security hardware and software company listed on Nasdaq and CBOE Canada. Public 0 investors
- C12 Quantum Electronics Paris company building quantum processors based on carbon-nanotube qubits. 1 investor
- Cambridge Quantum Quantum software company (tket), merged with Honeywell Quantum Solutions in 2021 to form Quantinuum. 0 investors
- Capella Space Synthetic aperture radar (SAR) satellite company, acquired by IonQ in July 2025 for space-based quantum communications. 0 investors
- CavilinQ Modular quantum interconnects for scalable, utility-scale quantum systems. Seed 1 investor
- Chiral Nano ETH Zurich spin-off making equipment to fabricate transistors from nanomaterials. Seed 1 investor
- Classiq Automated quantum software platform synthesizing high-level intent into hardware-aware circuits. Series C 4 investors
- CliniQuantum Ltd. Applies quantum simulation and quantum Monte Carlo methods to clinical trial data analysis. Subsidiary 0 investors
- ColibriTD Quantum computing software connecting simulation tools to quantum hardware for engineering problems. Seed 1 investor
- Crypto Quantique Quantum-driven secure silicon and IoT cybersecurity platform. Series A 1 investor
- CryptoNext Security Post-quantum cryptography software company for enterprise migration. 1 investor
- Cryptosense Acquired 2 investors
- D-Wave Quantum Public quantum computing company focused on annealing and gate-model systems. Public 1 investor
- Diffraqtion Somerville startup building quantum-camera satellites and telescopes for space and Earth imaging. Pre-seed 0 investors
- Diraq Silicon spin-qubit quantum computing hardware company. 2 investors
- DryLabz Basel company building AI diagnostics from clinical data and exploring quantum machine learning for healthcare. 0 investors
- EigenQ Austin-based quantum technology company focused on post-quantum security, going public via SPAC. 0 investors
- eleQtron Trapped-ion quantum computing hardware company. Series A 1 investor
- Entangled Networks Toronto quantum networking startup whose assets IonQ acquired in December 2022 to launch IonQ Canada. Acquired 0 investors
- EuQlid Quantum diamond magnetic imaging for non-destructive 3D inspection of semiconductors and batteries. Seed 1 investor
- evolutionQ Quantum-safe cybersecurity company focused on cryptographic risk management. Series A 1 investor
- Exail Technologies French maritime robotics and navigation group with a cold-atom quantum gravimeter product line. 0 investors
- Fermioniq Amsterdam spin-out (UvA, QuSoft, CWI) building quantum-inspired physics simulation software. 0 investors
- Fixstars Amplify Cloud platform and SDK for running combinatorial optimization on Ising machines and quantum computers. Subsidiary 0 investors
- Gooch & Housego UK photonics group making acousto-optic, fibre and precision optics components, including for quantum systems. Public 0 investors
- Good Chemistry Vancouver quantum chemistry simulation company (QEMIST Cloud, Tangelo SDK), acquired by SandboxAQ in 2024. Acquired 0 investors
- Honeywell Quantum Solutions 0 investors
- Horizon Quantum Quantum software infrastructure company with the Triple Alpha development environment and its own hardware testbed. Public 0 investors
- HQS Quantum Simulations Quantum simulation software company for chemistry and materials. Series A 2 investors
- HRL Laboratories Malibu R&D laboratory working on silicon-spin qubits and quantum sensing, acquired by IBM in August 2026. Acquired 0 investors
- ID Quantique Geneva quantum-safe security company (QKD, quantum random number generators, detectors), controlled by IonQ since 2025. Acquired 1 investor
- Infleqtion Neutral-atom quantum technology company spanning computing, sensing and timing. Public 2 investors
- Information Security Corporation PKI, encryption and credential management software vendor, acquired by SAIC in 2026. Acquired 0 investors
- IonQ Public trapped-ion quantum computing company. Public 0 investors
- IQM Quantum Computers Superconducting quantum computer manufacturer. Public 1 investor
- Irréversible Analog AI chips born from quantum control research, for ultra-low-power on-device intelligence. Pre-seed 1 investor
- Isara Post-quantum cryptography company for enterprise and embedded systems. Series A 1 investor
- Kipu Quantum Application-specific quantum algorithms compressing circuits for near-term, noisy quantum hardware. Seed 5 investors
- Kiutra Cryogenic systems company supporting quantum and low-temperature research. 1 investor
- KQC Quantum Busan company helping enterprises adopt quantum computing and post-quantum security; SPAC merger with CHAR pending. 0 investors
- Kvantify Software coupling quantum and classical computing to accelerate molecular discovery. Seed 0 investors
- Lake Shore Cryotronics Cryogenic temperature, magnetic measurement and cryostat equipment; part of DwyerOmega since 2026. Acquired 0 investors
- Lightsynq Technologies Quantum interconnect company building photonic networking hardware to scale quantum computers. Acquired 3 investors
- Maybell Quantum Cryogenic dilution refrigerator infrastructure built for scaling quantum computing systems. Series B 1 investor
- memQ Hardware for distributed quantum networking (xQNA), spun out of the University of Chicago. Series A 1 investor
- Menten AI Generative AI platform combining physics-based models and quantum simulations to design peptide macrocycle drugs. Seed 1 investor
- Mesa Quantum Chip-scale quantum sensors (atomic clocks, gyroscopes, magnetometers) for GPS-independent navigation and timing. 1 investor
- Miraex Thin-film lithium tantalate photonic chips for quantum interconnects; part of SEALSQ since June 2026. Acquired 0 investors
- Molecular Quantum Solutions Quantum chemistry software company for molecular simulation. Pre-seed 0 investors
- Multiverse Computing Quantum software and quantum-inspired AI model compression (CompactifAI) company based in San Sebastián. Series C 3 investors
- Munich Quantum Instruments Scalable superconducting nanowire single-photon detectors (SNSPDs). Pre-seed 1 investor
- Naoris Quantum Protocol Post-quantum distributed trust and compliance infrastructure for critical infrastructure and enterprise systems. 0 investors
- Nexus Photonics Heterogeneously integrated photonic chips; acquired by IonQ in 2026. Acquired 0 investors
- NHanced Semiconductors US advanced packaging foundry (2.5D/3D, hybrid bonding, chiplets), acquired by Quantum Computing Inc. in 2026. Acquired 0 investors
- Nomad Atomics Field-deployable quantum absolute gravimeters and geophysical survey services. 0 investors
- Nord Quantique Superconducting quantum computing company focused on error correction. Growth 3 investors
- Nu Quantum Quantum networking company building photonic interconnects for distributed quantum computing. Series A 3 investors
- NuCrypt Quantum optical instrumentation and quantum communications systems, acquired by Quantum Computing Inc. in 2026. Acquired 0 investors
- NVision Imaging Technologies Quantum hyperpolarization for metabolic MRI, expanding into photonic quantum computing with molecular qubits. Series B 0 investors
- Orange Quantum Systems Quantum test and characterization equipment company. Seed 0 investors
- ORCA Computing London-based developer of full-stack photonic quantum computers, spun out of the University of Oxford. Series A 3 investors
- Oxford Ionics UK trapped-ion quantum computing company spun out of Oxford, acquired by IonQ in 2025. 1 investor
- Oxford Quantum Circuits UK developer of superconducting quantum computers. Series C 2 investors
- Paragraf Mass-produces graphene-based electronic devices, including Hall-effect sensors used in cryogenics and quantum computing. Series C 4 investors
- ParityQC Quantum computer architecture and operating system for scalable quantum computers, spun out of the University of Innsbruck. 0 investors
- Pasqal Neutral-atom quantum computing hardware company. Public 4 investors
- PCB Engineering Acquired 0 investors
- Peak Quantum Munich startup developing error-protected superconducting quantum processors. Pre-seed 1 investor
- Phantom Photonics Quantum sensors for extreme environments, spun out of the University of Waterloo's Institute for Quantum Computing. 1 investor
- Phasecraft Quantum algorithms company focused on near-term quantum advantage. 0 investors
- Photonic Inc. Distributed quantum computing and networking built on silicon T-centre qubits linked by photons. 0 investors
- PINC Technologies Caltech spinout building integrated nonlinear photonic chips for quantum and AI. Seed 1 investor
- Pixel Photonics Single-photon detector company for quantum photonics applications. 1 investor
- planqc Neutral-atom quantum computing hardware company. Series A 4 investors
- Plurilock Security Canadian IT and cybersecurity services provider, including post-quantum readiness services. 0 investors
- PQShield Post-quantum cryptography solutions for chips, devices and software supply chains. Series B 1 investor
- Project Eleven Post-quantum cryptography company hardening Bitcoin and digital assets. Series A 1 investor
- PsiQuantum Photonic quantum computing company building fault-tolerant systems. Series D+ 3 investors
- Q-CTRL Quantum infrastructure software and quantum sensing technology company. Series B 6 investors
- Q*Bird Delft company (now Falqon Systems) building MDI-QKD devices for quantum-secure networks. 0 investors
- QANT Photonic computing and sensing company. Series A 2 investors
- Qblox Delft company building scalable qubit control electronics for quantum computers. Series A 1 investor
- qBraid Cloud platform giving developers access to multiple quantum computers and software tools. 0 investors
- QC Ware Quantum chemistry software (Promethium) and quantum computing services company. Series B 0 investors
- QDC.ai Optimization software applying quantum-inspired and hybrid quantum-classical methods. 1 investor
- QDevil Acquired 0 investors
- Qedma Quantum error mitigation and benchmarking software company. Series A 2 investors
- Qendra Control systems for trapped-ion and neutral-atom quantum computing experiments. 0 investors
- QHarbor TU Delft spin-off data storage and visualisation platform for physics labs, acquired by Quantum Machines in 2026. Acquired 0 investors
- Qnami Quantum sensing instruments using NV-diamond scanning probes for nanoscale magnetic imaging. Acquired 2 investors
- QodeX Quantum Agentic research platform for enterprise quantum teams, integrating quantum computing into machine learning workflows. Pre-seed 1 investor
- Qoro Quantum Software layer for orchestrating hybrid quantum-classical computing. Pre-seed 0 investors
- QPerfect Strasbourg quantum software company (MIMIQ emulator, QLU), acquired by BTQ Technologies in 2026. Acquired 0 investors
- QphoX Quantum transduction and networking company linking microwave and optical domains. 0 investors
- QT Sense Nanodiamond quantum sensing platform (Quantum Nuova) for detecting free radicals in living cells. 0 investors
- QuamCore Superconducting quantum processor architecture targeting one million qubits in a single cryostat. Series A 1 investor
- Quandela Photonic quantum computing hardware and cloud company. Series B 5 investors
- Quanmatic Quantum and quantum-inspired optimization algorithms and software for industrial problems, spun out of Waseda University. 0 investors
- Quantagonia Hybrid AI and quantum optimization software for enterprise decision-making. Acquired 1 investor
- QuantaMap Cryogenic scanning-probe microscopes with quantum sensors for inspecting quantum chips. 0 investors
- QuantaSense Quantum-limited parametric amplifiers for superconducting qubit readout. Pre-seed 1 investor
- Quantinuum Integrated quantum computing company combining hardware, software and cybersecurity. 0 investors
- Quantistry Berlin developer of a cloud-based chemical and materials simulation platform; assets acquired by IQM in 2026. Acquired 0 investors
- Quantized Technologies University of Calgary spin-off building quantum networking and quantum-secure communication technology. 0 investors
- Quantopticon Simulation software (Quantillion) for designing and modelling quantum-photonic devices. 0 investors
- QuantrolOx Machine-learning software that automates tuning and optimisation of superconducting quantum computers. Seed 1 investor
- Quantropi Ottawa-based developer of quantum-secure encryption software (QiSpace platform). 0 investors
- Quantum Art Multi-core trapped-ion quantum computers with multi-qubit gates. Series A 2 investors
- Quantum Benchmark Error diagnostics, error suppression and performance validation software for quantum computers (acquired by Keysight, 2021). Acquired 0 investors
- Quantum Brilliance Diamond-based quantum chips and products that operate at room temperature. Series A 2 investors
- Quantum Circuits Acquired 0 investors
- Quantum Computing Inc. Integrated photonics and quantum optics company making quantum machines and thin-film lithium niobate photonic chips. Public 0 investors
- Quantum Dice Oxford spin-out building photonic probabilistic computing hardware and self-certifying quantum random number generators. Pre-seed 2 investors
- Quantum Elements AI-native quantum software and hardware development platform (Constellation). 1 investor
- Quantum Machines Quantum control systems company for operating quantum processors. Series C 8 investors
- Quantum Motion Silicon CMOS spin qubit quantum computing using standard semiconductor manufacturing. Series C 4 investors
- Quantum Research Sciences Quantum software for US defense logistics, including supply-chain and part-obsolescence prediction. 0 investors
- Quantum Rings SDK for large-scale quantum circuit simulation on classical hardware, with access to real QPUs. 2 investors
- Quantum Signals AI-driven intraday trading signals for futures and ETFs, with a stated quantum computing roadmap. 1 investor
- Quantum Transistors Solid-state quantum processor combining natural qubits with photonic interconnects. 1 investor
- Quantum X Labs Ltd. Israeli quantum technology hub working on quantum algorithms, navigation and atomic clocks. Acquired 0 investors
- Quantum.IQ Technologies Vancouver-based post-quantum cryptography software, acquired by Redwood AI in 2026. Acquired 0 investors
- QuantumDiamonds Munich maker of diamond-based quantum sensing tools for non-destructive semiconductor failure analysis. 0 investors
- QuantWare Superconducting quantum processor supplier. Series B 4 investors
- Qubic Cryogenic quantum signal amplifiers that boost qubit readout signals, plus quantum-amplified microwave sensing. Seed 1 investor
- Qubit Pharmaceuticals Drug-discovery company using physics-based simulation and quantum-oriented methods. Seed 2 investors
- Qubitekk Vista, California quantum networking hardware and software company, acquired by IonQ in December 2024. Acquired 0 investors
- QuEra Computing Neutral-atom quantum computing company. Series B 0 investors
- QuintessenceLabs Quantum cybersecurity hardware and software using quantum random number generation to create encryption keys. 1 investor
- QuiX Quantum Photonic quantum computing company building a universal photonic quantum computer. Series A 1 investor
- Quminex Uses AI and quantum computing to turn mineral exploration data into target signals. Pre-seed 3 investors
- QunaSys Quantum software company focused on chemistry and materials simulation. 0 investors
- Qunnect Quantum networking hardware that runs over existing telecom fiber. Series A 3 investors
- Quobly Grenoble start-up developing a fault-tolerant quantum processor on silicon, using semiconductor-industry processes. 0 investors
- Quoherent Room-temperature qubits based on topological materials, aimed at edge-capable quantum processors. Seed 0 investors
- Rhonexum EPFL spin-out developing cryogenic electronics for scalable quantum computers. Pre-seed 0 investors
- Rigetti Computing Full-stack superconducting quantum computing company, NASDAQ:RGTI. Public 4 investors
- Riverlane Building the quantum error correction stack (Deltaflow) for fault-tolerant quantum computing. Series C 0 investors
- SandboxAQ AI and quantum technologies platform spun out of Alphabet; PQC and quantum sensing. Series D+ 0 investors
- SBQuantum Sherbrooke company building quantum diamond magnetometers for navigation, defense and space. Seed 2 investors
- Scenario X AI and quantum analytics platform for risk modeling and scenario analysis at financial institutions. 1 investor
- SemiQon VTT spin-off developing silicon-based quantum hardware, including transistors optimised for cryogenic operation. 1 investor
- Silicon Quantum Computing Atomic-precision silicon quantum computing company spun out of UNSW. 0 investors
- SilQ Connect Microwave-optical quantum interconnects (qLAN) for distributed quantum computing. Pre-seed 3 investors
- Sitehop FPGA-based hardware encryption with post-quantum algorithms for low-latency networks. 1 investor
- Skyloom Global US developer of optical communication terminals, acquired by IonQ in January 2026. Acquired 0 investors
- SkyWater Technology US semiconductor foundry with superconducting and quantum manufacturing services, acquired by IonQ in 2026. Acquired 0 investors
- SMART Photonics Indium phosphide (InP) photonic chip foundry serving telecom, datacom, sensing and quantum customers. 1 investor
- Snowcap Compute Superconducting compute platform for AI, HPC and quantum data centers. Seed 0 investors
- SQK Develops QMEDIC, a CT image reconstruction platform using hybrid quantum-classical algorithms. 1 investor
- Strangeworks Unified cloud platform for quantum, HPC and AI compute orchestration. Series A 1 investor
- Terra Quantum Swiss quantum technology company offering quantum security, hybrid quantum-classical computing and optimization software. 0 investors
- TuringQ Shanghai developer of photonic quantum chips and photonic quantum computing systems. Series C 0 investors
- Vector Atomic Quantum sensing company building optical atomic clocks and atomic inertial sensors, acquired by IonQ in 2025. Acquired 0 investors
- Vescent Photonics Compact, low-SWaP lasers, optical frequency combs and control electronics for quantum and timing applications. 0 investors
- Wave Photonics Computational photonics design platform for quantum, sensors and data-center PICs. Seed 1 investor
- Wecan Group Compliance software for KYC/AML onboarding and periodic reviews at regulated financial institutions. Subsidiary 0 investors
- Welinq Quantum memories and quantum links connecting QPUs into a quantum data centre fabric. Seed 2 investors
- WISeSat.Space Nanosatellite operator providing IoT connectivity secured with post-quantum cryptography. Public 0 investors
- Xanadu Photonic quantum computing company building fault-tolerant systems. Public 1 investor
- Xatoms AI + quantum chemistry platform discovering solar-activated photocatalysts for water purification. Pre-seed 1 investor
- Yaqumo Developer of scalable neutral-atom quantum computers. Seed 1 investor
- Zama Open-source fully homomorphic encryption (FHE) for blockchain, AI and the cloud. Series B 1 investor
- Zapata AI Hardware-agnostic quantum software company, relaunched in 2025 after suspending operations in 2024. Public 0 investors
- ZuriQ Trapped-ion quantum computers built on a 2D architecture, spun out of ETH Zurich. Seed 2 investors
No companies match your filters.
Try clearing a filter or your search.
Try clearing a filter or your search.