| Company name | Area of Quantum | Headquarters |
| 1QBIT | Software (quantum computing) | Vancouver, Canada |
| A Star Quantum | Software (quantum computing) | Japan |
| AbaQus | Algorithms | Vancouver, Canada |
| Accenture | | Dublin, Ireland |
| AEGIQ | Photonics and Integrated Photonics, Quantum Dots, Cryptography, Photonic Quantum Computing | Sheffield, UK |
| Agnostiq | High Performance Computing, Open Source HPC/Quantum Workflow Manager, Quantum Software | Toronto, Canada |
| Airbus | Algorithms | Blagnac, France |
| Algorithmiq | Software (quantum computing) | Finland |
| Alibaba | quantum computing | China |
| Alice&Bob | Superconducting cat qubits | Paris, France |
| Aliro Quantum | Quantum Development Environment, Quantum Network Simulation/Emulation | Boston, MA, US |
| Aliyun (Alibaba Cloud) | Superconducting | Hangzhou, China |
| Alpine Quantum Technologies | Trapped Ion | Innsbruck, Austria |
| Amazon Braket | quantum computing | USA |
| AmberFlux | Quantum Programming, Classical Simulation, Optimization, Algorithms, Quantum Financial Services | Hyderabad, India |
| Anyon Systems Inc. | Superconducting quantum processors, cryogenic systems, control electronics, software development kit | Montreal, Canada |
| AT&T | | Dallas, TX, USA |
| Atlantic Quantum | Hardware (quantum computing) | USA |
| Atom Computing | Cold/Neutral Atoms, Quantum Algorithms | Berkeley, CA, USA |
| Atomionics | quantum sensing | Singapore |
| Atos | Quantum Programming, Classical Simulation, Cryptography | Bezons, France |
| AUREA Technology | Single-photon source, Photon counting, Quantum key distribution, Photonics, Single-photon avalanche diode | Besancon, France |
| Automatski | Applications, Quantum Computers, Quantum Simulators, Quantum Annealers, Classical Solvers | Bengaluru, India |
| Baidu | Algorithms | Beijing, China |
| BEIT | Software (quantum computing) | Poland |
| Bleximo | Application Specific Superconducting | Berkeley, CA, USA |
| BOLTZ.AI | Quantum Application, Quantum Algorithms, Quantum programming, Quantum Consulting | Toronto, Canada |
| Booz Allen Hamilton | | Tysons Corner, VA, USA |
| BosonQ Psi | Software (quantum computing) | USA |
| Boxcat Inc. | Quantum Algorithms, Quantum Rendering, Quantum Image Processing, Super-Resolution, Quantum Machine Learning | Toronto, Canada |
| BT | | London, UK |
| C12 Quantum Electronics | Hardware (quantum computing) | France |
| Carl Zeiss AG | | Oberkochen, Germany |
| Classiq | Quantum Algorithms Quantum Software | Tel-Aviv, Israel |
| CogniFrame Inc | Quantum Algorithms Quantum and Near Quantum Solutions to solve NP Hard, Optimization, Simulation & Machine Learning problems. Has launched Plug and Play app store www.firstqstore.com | Toronto, Ontario, Canada |
| ColdQuanta/Infleqtion | Trapped neutral Cesium atoms | Boulder, CO, USA |
| ColibrITD | Quantum Algorithms Quantum Software Quantum Platform | Paris, France |
| Cube Robot X | Photonic, Trapped Ion, Quantum Algorithms, Quantum Programming, Robotics | Langweid am Lech, Bavaria Germany |
| Diraq | Hardware (quantum computing) | Australia |
| D-Wave | Superconducting Quantum Annealer | Burnaby, Canada |
| EeroQ | Hardware (quantum computing) | USA |
| eleQtron | Trapped Ion | Siegen, Germany |
| Elyah | Quantum Programming, Classical Simulation, Software as a service | Tokyo, Japan |
| Entangled Networks | Quantum communication algorithms, Quantum networking fabrics | Toronto, Canada |
| Entropica Labs | Quantum Algorithms, Quantum Programming, Quantum Machine Learning, Quantum Software Tools, Open Source Software | Singapore |
| EVIDEN | quantum computing | France |
| Fujitsu | quantum simulator, digital annealer | Japan |
| Google Quantum AI | quantum computing | USA |
| Google QuAIL | Superconducting | Mountain View, CA, USA |
| HIQUTE Diamond | NV Center for Quantum Sensing | Villetaneuse (Paris), France |
| Hitachi | Silicon CMOS | Hitachi Cambridge Laboratory, UK and Tokyo, Japan |
| Horizon Quantum Computing | Quantum Algorithms, Quantum Compilation, Quantum Programming, Software as a service | Singapore |
| HP | Algorithms, NMR | Palo Alto, CA, USA |
| HQS Quantum Simulations | Quantum Algorithms, Quantum Programming, Classical Simulation | Karlsruhe, Germany |
| HRL Laboratories | Quantum Dots | Malibu, CA, USA |
| Huawei Noah's Ark Lab | | Shenzhen, China |
| IBM | Superconducting | Armonk, NY, USA |
| ID Quantique | quantum communication | Geneva, Switzerland |
| imec | Superconducting | Belgium |
| Infineon Technologies | Trapped Ion, Post-Quantum Cryptography | Neubiberg, Germany |
| Intel | quantum computing | Santa Clara, CA, USA |
| ionQ | Trapped Ion | College Park, MD, USA |
| IQM Quantum Computers | Superconducting | Espoo, Finland |
| JiJ | Software (quantum computing) | Japan |
| KEEQuant | Continuous Variable QKD, Key Management Systems (KMS) | Fürth, Germany |
| Kipu Quantum | Quantum Algorithms | Munich, Germany |
| KPN | | The Hague, Netherlands |
| Kuano | Software (quantum computing) | United Kingdom |
| Kvantify | Software (quantum computing) | Denmark |
| Lockheed Martin | Quantum Annealing | Bethesda, MD, USA |
| MagiQ | | Somerville, MA, USA |
| main incubator | Quantum Financial Services | Frankfurt, Germany |
| Maybell Quantum Industries | Hardware (quantum computing) | USA |
| Microsoft Research QuArC | Algorithms | Redmond, WA, USA |
| Microsoft Research Station Q | Superconducting | Santa Barbara, CA, USA |
| Multiverse Computing | Software (quantum computing) | Spain |
| Nanoacademic Technologies Inc. | Quantum Dots | Montreal, QC, Canada |
| NEC Corporation | Quantum Dots | Tokyo, Japan |
| Next Generation Quantum | Optical quantum interconnects for quantum computing clusters | New York, NY, USA |
| Nokia Bell Labs | | Murray Hill, NJ, USA |
| Nord Quantique | Hardware (quantum computing) | Canada |
| Northrop Grumman | | West Falls Church, VA, USA |
| NTT Laboratories | Photonic Quantum Computing, Quantum Communication | Tokyo, Japan |
| Nu Quantum | Photonic Quantum Computing, Quantum Communication | Cambridge, UK |
| Nvidia | HPC/QC platforms | USA |
| ORCA Computing | Hardware (quantum computing) | United Kingdom |
| Origin Quantum | Hardware (quantum computing) | China |
| Oxford Ionics | Hardware (quantum computing) | United Kingdom |
| Oxford Quantum Circuits | Hardware (quantum computing) | United Kingdom |
| ParityQC | Quantum architecture, Quantum Algorithm, Software-as-a-Service | Innsbruck, Austria |
| PASQAL | Quantum Algorithms, Quantum Hardware | Massy, France |
| Phasecraft | Quantum algorithms | Bristol, England and London, England |
| Photonic Inc | Hardware (quantum computing) | Canada |
| planqc | Hardware (quantum computing) | Germany |
| PolarisQb | Software (quantum computing) | USA |
| ProteinQure | Software (quantum computing) | Canada |
| PsiQuantum | Photonic Quantum Computing | Palo Alto, CA, USA |
| Q. BPO Consulting | QML Q-ANN Optimization | Paris, France |
| Q.ANT | Photonic Quantum Computing, Quantum Algorithms | Stuttgart, Germany |
| Qblox | Quantum Control and Readout, Quantum Computing Software | Delft, Netherlands |
| QC Ware | Software (quantum computing) | USA |
| Q-CTRL | Quantum sensing and computing | Australia |
| Qilimanjaro Quantum Tech | Fast-to-market app-specific quantum computers with true quantum benefits by co-designing chips & algorithms and bypassing the qubit fragility barrier | Barcelona, Spain |
| QM Ware | quantum software and systems | Switzerland |
| QNu Labs | Quantum Key Distribution, Quantum Random Number Generators | Bangalore, IND, USA |
| QpiAI | Quantum Algorithms, Quantum Hardware | Bangalore, IND, USA |
| QRCrypto SA | Post-quantum symmetric cryptography for use within and outside of Quantum key distribution networks, including 5G, IPTV and PKI. Quantum-resistance testing of cryptography in laboratory environments. | Fribourg, Switzerland |
| QRDLab | Superconducting | Kolkata, India |
| Qrypt | Cryptography | New York, USA |
| Quandela | Photonic Quantum Computing | Palaiseau, France |
| Quantagonia | Quantum Algorithms, Hybrid Computing, Quantum Software | Frankfurt am Main, Germany |
| Quantastica | Software (quantum computing) | Finland |
| Quantinuum (merger of Honeywell Quantum Solutions and Cambridge Quantum Computing) | Trapped Ion hardware, quantum software stack, quantum algorithms | Cambridge, UK and Broomfield CO, USA |
| Quantized Technologies Inc. (QTI) | | Calgary, Canada |
| QuantrolOx | Quantum computing | United Kingdom |
| Quantum Benchmark | Quantum software for co-design of error-robust applications, algorithm performance optimization, cross-platform assessment tools, error detection and suppression | Kitchener, Ontario, Canada |
| Quantum Brilliance | Diamond defect spin | Canberra, Australia |
| Quantum Circuits, Inc. | Superconducting | Connecticut, USA |
| Quantum Computing Inc. | Quantum computing applications | Leesburg, VA, USA |
| Quantum Generative Materials (GenMat) | Software (quantum computing) | USA |
| Quantum Machines | Quantum control electronics and software | Tel Aviv, Israel |
| Quantum Motion | Hardware (quantum computing) | United Kingdom |
| Quantum Source Labs | Photonics Quantum computing | Ness Ziyona, Israel |
| Quantum Thought | Quantum Algorithms | California, USA |
| QuantWare | Hardware (quantum computing) | The Netherlands |
| Qubit Pharmaceuticals | Software (quantum computing) | France |
| Qubitrium | Quantum communication, Information security, Quantum imaging | Istanbul, Turkey |
| Qubrid | Hybrid Classical-Quantum Cloud Platform, Quantum Algorithms | McLean, VA |
| QuEra Computing | Neutral Atoms | Massachusetts, USA |
| QuiX Quantum | photonic quantum computer | The Netherlands |
| Qulabs.ai | Quantum cryptography | NJ, USA & Hyderabad, IND, USA |
| QunaSys | Software (quantum computing) | Japan |
| Qunnect Inc. | Optical quantum interconnects for quantum communications and etanglement distribution | New York, USA |
| Quobly | | Grenoble, France |
| QuSecure | Post-Quantum Cryptography | California, USA |
| QxBranch | | Washington, D.C., USA |
| Raytheon/BBN | Superconducting | Cambridge, MA, USA |
| Rigetti Computing | Superconducting | California, USA |
| Riverlane | Error correction and Control systems and Algorithms | England, UK |
| SandboxAQ | Software (quantum computing) | USA |
| SaxonQ | NV centers | Leipzig, Germany |
| Seeqc | Quantum Computing, Superconducting Electronics | Elmsford, NY, USA |
| S-Fifteen Instruments | quantum communication | Singapore |
| Silicofeller | Superconducting | Delhi, India |
| Silicon Quantum Computing | Atom qubits in silicon | Sydney, New South Wales, Australia |
| Speqtral | quantum communication | Singapore |
| Strangeworks | Software (quantum computing) | USA |
| Taqbit Labs Pvt Ltd | Quantum Communication | India |
| Terra Quantum | Quantum Computing, Quantum Metrology & Sensors, Quantum Cryptography, Quantum Random Number Generators | Rorschach, Switzerland |
| ThinkQuantum | Quantum Key Distribution, Quantum Random Number Generators | Sarcedo, Italy |
| Toshiba | Quantum Dots | Tokyo, Japan |
| TuringQ | Hardware (quantum computing) | China |
| Turkcell | Telecommunication | Istanbul, Turkey |
| Universal Quantum | Trapped Ion | Hayward's Heath, UK |
| Xanadu Quantum Technologies | Photonic Quantum Computing | Toronto, Canada |
| XeedQ | Diamond defect spin | Leipzig, Germany |
| Zapata Computing | Quantum Algorithms, Orquestra Quantum Operating Environment | Boston, MA, USA |